At least we can say that she did not regurge due to improper temps.

While your temps sound fine, I have to agree with Slim about the egg crate divider. It won't help isolate illness and mites (sounds like your mite problem is solved though). If you want to keep your male healthy, it is highly recommended to totally separate the female. You can use a solid wall, but the best thing is to put her in quarantine in a separate enclosure.

She sounds small, a hatchling? Since it sounds like you can't use any other tanks, she will do well in a temporary 6qt-15qt tub set up until she is well again or if you find out she's not contagious. At walmart a 6qt tub is $2. A 15 qt is less than $5. A foot of flexwatt from a reptile store ranges $2-5. (flexwatt heat tape needs a thermostat.)
The small space will probably reduce some stress on your girl as well. Tubs also make great carriers for vet trips.

All in all, just think of it as keeping a newborn child away from a sick sibling.

Good luck.
Hope she gets well soon.
Keep us updated.