What weight is she and what have they said she needs to be? I've got 3 cats that are very different body shapes and also very different weights, and I've not been told my cats are overweight (well the 19 year old one was as he was almost 2 stone when I got him, but I slowly slimmed him down, now I need to fatten him up a little as he's losing muscle tone as he's a lot less mobile).