My beardie is not eating properly?

i have had her since xmas 2010 and she is 11 months old and a very big girl, she is bigger then my other 2 adults! my boyfriend bought me her from a very very good breeder and she was quite expensive and came with paper work and certificates but whatever i put in her viv she is just not interested. I have tried crickets locust meal worms all varieties of veg and fruit that she is allowed to eat but she dont seem to get excited as my other beardies do. I have 7 beardies althogether and my 2 adults love their veg and live food, i hand feed them aswell and they always come running to the viv when they know its feeding time. I also have 4 babies and they also love their veg and live food! But my new dragon will only eat locust if they are right in front of her, she wont chase them and im not sure i have seen her eat a whole bowl of veg, she picks at it after its been in there for a few hours... anyone know how i can get to to eat more? im keeping an eye on her weight by weighing her every week she is 370 gramms at the moment (like i said a big girl for 11 months) she was 366 gramms when my boyfriend bought her so she has only gained 4 gramms since xmas time. im a little worried... any help with be appreiacted. (: