I'm leaning towards her being a cinnamon. She looks greywing in the first photo, but when put next to the other budgie she has a distinct brown tint in the wings, though that could be a trick of the light when compared to the yellow in the wings.
But yes, she looks to be a YF Type 2 Opaline Sky Blue.
You know you might have too many budgies when you're not sure if you've remembered them all!
Charlie - Cinny - Dante - Gidget - Jimmette - JJ - Jules - Mo - Ollie - Peanut - Penny - Pie - PJ - Pockie - Sally - Simon - Snowy - Song - Sora - Spang - Tommy