I can see the pewter male for producing more morphs in a clutch.
However, as far as improving the look of a particular morph, which is MY thing but maybe not yours, I think she has a lot to offer for improving the look of the fire gene as far as I'm concerned.
Now as to the possible het thing. You don't say what she might be het to, since you don't mention what recessive snakes the breeder had, but if you wanted a gamble, I'd go with the ghost male. She is light enough to make you suspect het ghost influence.
Gale