Any ideas to raise her self esteem?

This happened with my ex. She was honestly the most beautiful girl I'd ever seen and even now when I see her I stop mid-sentence because she literally takes my breath away. Even though I told her when we were dating how I thought she was perfect and gave her sincere heartfelt compliments daily about her beauty she still thought she was ugly. One thing that really seemed to help though was to look her in the eye and tell her it doesn't matter what she thought or what other people thought because in my eyes she was flawless. Try it, hopefully it works.

This is a hard one. I know it seems like complimenting her and all will help. but it wont. I know because I am also struggling with self-esteem. I told my Boyfriend about it hoping he would help me. and I noticed he has been trying. He compliments me so much, and he would even criticize other women. He also shows me how much I really mean to him, and how much he appreciates me. I thought it worked, but then I realized the more attention and praise I got the more insecure I became. I would feel so worthless if he wasnt complimenting me or showing me attention and love. I truly believe that self-esteem can only be fixed by that person alone. The only thing you can do is be there for her and show her you love her just as much, regardless of the personal issues she's going through. Because, something that I always worry about is how my Boyfriend sees me or feels about me, being so insecure and all. I worry that maybe it is turning him off, or maybe he is starting to lose interest because of my lack of self confidence. so sometimes I pretend that I'm ok, or I pretend to be confident. which is really hard. So I suggest you continue to show her how much you love her, and be supportive.

That sounds like me a while ago!
The only thing you can really do is what ramkid said. Tell her that she is perfect the way she is, and you love her no matter what others say...and throw in a compliment or two...
A really great thing to do is when you're lying down somewhere...just caress her hair and maybe bury your head in her hair (if she has a lot of it)...just breath in deep...
Or you can just hold her hand, sit somewhere and do lines across her face with your finger...touch her nose, cheeks, lips...just trace her face line with your fingers...show her you appreciate everything about her... ;)