I would guess lesser pastel due to the fading and blushing, and the fact that that's what she was sold to you as.
I think the blushing, particularly on the head, is a better indicator than the amount of yellow. I know that when I bought my lesser (not lesser pastel), he had a TON of bright screaming yellow as well as some blushing, and was out of a lesser x pastel clutch. So naturally, I had to ask the breeder how he knew that it wasn't a lesser pastel(Like, obviously I as the buyer would know better than the breeder, right?
) He said that the difference between them is obvious in siblings, and one of the major markers is the amount of blushing on the head ...
So again, I'd go with lesser pastel because of A. the blushed out appearance and B. the fact that the breeder presumably saw her next to her regular lesser siblings and therefore should have theoretically had the best basis for comparison.
(I like her, BTW, even if she isn't screamingly yellow)