One of the problems with her incubating is she wont eat while on the eggs. I hope you took the other snake out because that will stress her out more.

I would shoot for 80-90% RH. Making an incubator with a cooler/ice chest, heat tape and a tstat is pretty easy and will give you better odds of sucess. That said there are those who let mom incubate but it definately involves alot more work and maintenance.