Friend with possible eating disorder?

I think a friend of mine may have an eating disorder. She was never overweight, per se, maybe just a little tiny extra weight around the middle. Well, awhile back she lost some weight, and I really didn't think much of it, but now I'm starting to wonder if she may have a problem.
She isn't to the point of looking sick, but she is definitely looking too thin, IMO. Now, I say IMO, because maybe I'm wrong?  I'm thin myself (when not pregnant), but to me, to be purposely keeping yourself probably somewhere between 105 and 110 pounds (she's prob about 5'4" or 5'5") with somewhat severe caloric restriction is a little overboard. She counts all her calories and I think she keeps between 1000-1200 calories. She often vetoes lunch places when we go out because she wants one particular place that has a very low calorie dish (she checks the restaurants' websites before we go).
She is very judgmental of overweight people too as of late, sometimes being very vocal and rude about a passerby's weight. This is to the point where I am embarrassed to be with her, and worried that someone will overhear her and start an altercation.
She has also told me that pregnant women get so fat and that she would now prefer a surrogate (she's been TTC for some time now) just so she wouldn't "get fat".
It's hard to approach her, because she just thinks people are "jealous" of her because they are not as thin as her.  She would likely think the same of me. She has often said comments about my post-baby body that were not directly mean, which is why I've never confronted her about them, but could definitely be hurtful.

I don't know whether I should leave it alone, or whether I should let her know that I'm worried about her and hope she doesn't jump on the defensive?

Sounds like my SIL who was what I call "controlled thin". It is a problems on many different levels and usually is caused my something completely unrelated to food.

Sadly by being too thin she can make it very difficult to conceive. With women the lower your body fat you'll end up missing periods as your body knows it can't sustain another being, plus hormonal craziness.

I was always very thing 5'10 and 120lbs but I ate like the dickens...so she would compare herself to me. Nutritionally it's not the same and that is hard for people to see.

My SIL has now given up her control diet and is getting quit hefty as she takes her issues out on something else. I did mention to her that she didn't look good after going Vegan(this was the height of her control issues) but I think I was the only person in the family that could get away with saying that to her because I was thin, so I think you have a good chance at opening her eyes in my opinion.

Good luck!

if she is restricting calories like that and obsesses over calories so much that she checks all restaurants before going, she has a problem. i would bet her difficulty ttc is weight related if she is even getting her period (which will eventually stop if it hasn't already).

approaching her would be very hard and i think you're right about her getting defensive and upset, but as a friend who is concerned i can see how hard it is for you to watch a friend do that to herself. i would say something but not be surprised if it backfires. she will need to realize what she is doing to herself before she changes and it doesn't sound like she is there yet.

sorry she is being rude to you, i know some super thin people who are always calling people "fatties" and talking about other's weight. i cannot stand it! it's always people who are weight obsessed who do it and sometimes i wonder if THEY are jealous that those normal to overweight people seem so happy and carefree and don't live their lives based around calorie counting!

I really don't take offense too often to what she says, unless I'm just having a bad self-esteem day for some reason. Like I said, I'm generally thin myself, just now that I'm pregnant of course I'm gaining weight. And regardless of any sneaky "I didn't mean anything by it!" comments she has made, for having twins I'm really usually pretty satisfied with my appearance. (Although I don't like someone trying to make me doubt myself).

This is more just concern for her health and embarrassment over her (loudly-voiced) public criticisms of strangers. I mean, in the summer I actually was afraid to go to the beach with her sometimes because I was sure one of these days, someone would confront her for one of her comments.

I know that at this weight, ttc could be hard. But she has been ttc for many years before losing the weight, so I don't think this is really the issue. I know it doesn't help, but she is kinda at the point that she is giving up anyway. (And like she said, she wants a surrogate now anyway so she doesn't get "fat").  I'm just worried about what's going on with her. She doesn't seem very happy lately. I sometimes feel that maybe she isn't as happy in her marriage as she used to be and maybe her depression is manifesting this way?  She's very private, so while I feel like I wish I could say or do something to help, I doubt she'd open up to me.