Just some advice but prove her out before you put a huge price tag on her.

If she came from a pairing that didn't involve a fire you can rule out her being fire. ( just basing on you saying she looks nothing like her normal siblings )

Believe it or not there are some weird looking ball pythons that look 100% unique that carry no genetic mutation.

I'd just be careful with the label as you can develop a very bad rep if she turns out normal. Besides if she's 1800 grams you can prove her out with minimal time and effort.