New boyfriend to potential anorexic! Please help!

Hey everyone, this is my 1st time reaching out to a forum for any kind of help yet, its for my girlfriend. We have been dating 2 months as of tomorrow and I am a year and 6 months older than her. I havent known her for long but there is something so amazing that I cant wrap my head around about her. Recently, she has entrusted me with some of her secrets.. She has an obsession with what they call, "Thinspiration", she has blogs and pictures like crazy about it. She let me read her blogs and I was less than impressed.. They really concerned me as she was beating herself up over what she has aten and how disgusting she thinks she is. Keep in mind, she doesnt look anorexic at all but its like when she eats, she completely hates herself. I know this has been going on for 5 years in her mind but she doesnt see a problem with it. Shes has tried to make an effort to give it up by giving me her books from the past 5 years that involve various diary entries of how disgusting she is from viewpoints of herself, "Ana" and "Mia". Apart of me feels selfish for being in a relationship with her and wonders if she should work on herself 1st but I care about her alot. I dont see how this amazing, beautiful girl can say such bad things to herself all the time. She has a history of not eating and also doing "B&P". She ideally will try and consume 400-800 calories at most a day and feels like she is a worthless, disgusting human. I dont know what to do. My question is, is this the onset of anorexia? Does she have the potential to become seriously ill like I think? I tell her how beautiful she is every chance I get but I know that people with anorexia need more.. Should I suggest therapy? Everytime she knows I am hurting, she gets even more angry at herself for causing me pain.. This girl is so amazing and I dont want to lose her. I want her to see how wonderful she is! Please help.

[ProudMumToBe]

Anorexia is not a Disorder based on someone's weight, if someone is not under weight it does not rule out them suffering the Disorder a common Misconception that stops many sufferers from seeking help.
I would suggest sitting down and talking to her and letting her know how much You care and how You are worried that You would like her to see a therapist and would like to support her