Ah yes... they will try and get away with not eating their proper food. If she is well enough cut out all the high fat seedy stuff.
When Casper came to us at age 25 he was overweight and had a fatty liver and was filthy. Previous keeper had just fed him on sunflower seeds because "that is all he will eat, he just chucks the rest out". They didn't realise the harm it was doing him. He was also in a tiny cage getting no exercise and with only a bell to play with so his perches were nearly chewed through and his top beak was so long it nearly reached his chest. He had quite a few vets visits to get it back to shape.
We are perhaps over-compensating with attention but he deserves it, I am amazed he still likes humans.