Could be, but i would say no. I have birds that are definately green, not blue. But in the light many of their feathers can appear bluey green, or have a blue sheen to them. Blue birds lack yellow pigment, so green birds are a mix of blue and yellow - they arent just green!
Often you will see a certain shade of colour in different lighting or angles. I would say her yellow is too strong to be YF blue.