Happens to the lot of us really.

I'm not a great lookign guy by any stretch of the imagination but I don't worry about other peoples opinions enough to let it bother me.

Sadly alot of people do but the only way to help is give her all the compliments and encouragement she needs.

Being confident is alot more attractive than looking nice but having both is great. If you can make her love herself for who she is then you're set.