As Deborah just suggested, this is exactly why it's very irresponsible of the owner to sell this snake & not tell you her real condition.
Being in a new home is scary & stressful enough on a snake...let's hope that she doesn't end up being egg-bound (-needing a vet's help!).
And I agree: if you're that tight on money, a new pet (gravid or not) is truly not a good idea. You need to plan for vet bills...you never know when a pet
may need medical care...it's just like any other family member, or should be...
It's not hard to make an incubator, but you'll need to heat & regulate it...those things do cost money, and then all the snakes that hatch need
housing, care & food. Breeding snakes is a great way to lose money, lol.