I purchased an unweaned Grey before I knew it was such an issue

[DonnaBudgie]

As long as her vet says she's fine I'd say she's fine. There can be a pretty big normal size range for parrots. I have budgies that weigh 28 grams and others all the way up to 65+ grams and none of them are obese. Cockatiels can weigh 70- 120 grams.

 

[DonnaBudgie]

They say that male Greys weigh more than females.