As said by others, the bird needs to be got out of the avairy and manned/walked round plenty of different places, we normally walk round with birds on the glove whilst walking dogs etc, or take out whilst flying other birds, in the house (if allowed by other half), in garden, take to friends houses and sit in their gardens.
If the bird is only used to one place then she will only want to do things ie eat, jump over, etc in that one place!
As also said the weight needs to be checked, as your mate starts dropping her weight the need for food will take over and she will be more likely to come o