Sounds like she might benefit from learning some resilience strategies. It also sounds like she lacks self confidence/self esteem.

No personal experience here, but I've taught similar children so this is what I'd suggest:

Try looking up some of the great parenting sites...triple P stuff comes to mind. They have fact sheets with easy to follow strategies (I use these with DS). It might also be worth talking to the school and finding out which social skills program they use so you can continue it at home. They should have other suggestions too. I've seen classes advertised in WA that claim to improve self confidence, self esteem etc. Not sure if they work, but you could always search for something like that in your area.

HTH