I would think that possible double het for snow FEMALES from reliable sources are pretty pricey. I don't even remember seeing one for sale (if I did, it was probably out of my price range). Of course the big concern is if you can verify that she really is a possible double het.
I don't even remember exactly what I paid for my possible double het male but it was a good deal at several hundred dollars a few years back and I think I’ve seen them for more since. So far he has proven to be het for albino and it will be at least two more years before I can even have a shot at proving him to be het Jolliff axanthic (unless someone wants to loan me a het Jolliff girl to try him on).
If you get the female and you think she might really be legit then it would be a shame to breed her to a normal male since females are so much more valuable. If she is a hatchling you could save up and try to find a possible double het male of the same axanthic line next year and possible have both ready to breed the following year. Or you could try to find someone local to wherever you are with a for sure double het male willing to do a breeding loan.