S.,
It sounds like you have done what you can verbally to praise and encourage your daughter. Now it may be time for her to see for herself. Think about what things she is good at. Does she have any hobbies? If not, think about one that you think that she could pick up easily and really excel at. Each child really does have at least one thing that they are gifted at, more so than most children. So get her involved in that activity. Be sure to initially talk to the teacher and let them know your goal....to let her see for herself that she is making a difference, and boost her own self esteem. A hobby like: art, a sport, scrap booking, tutoring another younger child at something she is good at--math etc....or helping another at their self esteem. She, like the rest of us, may want to feel needed. Like she is really helping someone else. I know it makes me feel great to help others!!
How is she appearance wise? Is she well put together? Healthy? Appropriate weight? Glasses? Hair clean and cut nicely? Clothing fit and she likes them? Or is she over/under developed for her age, making her feel awkward and different from the rest of her peers?
It is hard to advise when there are so many factors that can determine why she feels the way she does. I would be happy to talk more about it if you want to provide me with more details. I am realy good at this sort of thing. I love to raise other's self esteem and have a good reputation (with family and friends, and their friends and all of their kids too!).
I have done countless makeovers...whether it be clothing, hair {cuts, colors, hairsylying} room makeovers, life coaching- fit for the age of the person... and general discussion that the person typically isn't trying to hear from mom or dad. Remember, to them...at that age, the parent's opinion doesn't count...we are talking PRE-TEEN here-attitudes adjusting,opinions forming, rebellious thought maybe developing...(NOOOOO!) where hormones play a major factor. Again, let me know if I can help.
Sincerely,
A.