Theres the senegalus senegalus or the yellow vest senegal. And the senegalus mesotypus, the orange vest senegal. (plus the senegalus versteri, the red vest one, but I think we can rule that out).
From the pictures she looks very yellow, but with an orange tinge. I know that some breeders crossbreed the orage and yellows. So who knows. She might be 80% senegal and 20% mesotypus.
But then again, I just spoke to Kika's breeder today and he told me Kika is very deep orange for a mesotypus. So maybe your organge/yellow Kili is a mesotypus too?
I'm realy sorry that this is a dutch site. But it has a very clear coloured picture of what the vest colouring should be per subspecies:
http://www.poicephalus.nl/soort%20seneg ... pegaai.htm