Hi & welcome, I'm so pleased you are trying to help your granda.
As Talon has rightly said, as for the toys she will be wary of anything new,let her see you playing & enjoying the new toy,dont hang anything unfamiliar in her cage at this point, if she sees you curiosity may get the better of her & she may well show some interest.
As with the toys do the same with the fruit & veg, keep offering them to her in her bowl, she may only play with new food or throw it out but she will have a little nibble at some point.
Try a variety of things until you find what she likes.
Has she has a vet check up lately ? I think it would be beneficial if you could take her for a general check up.
Please let us know how things go.