Bad Gash! What to do until vet visit?

I have to agree with everyone saying split them up as soon as you can. It may seem like they wont have problems and that's what i thought when i first got my balls. But there is a chance of them wrapping each other up and this is not only extremely stressful on the snakes but on you as well. Its scary having to untangle two of your snakes, especially when they're latched onto each other and trying to suffocate each other.
Speaking from experience of housing two balls in the same enclosure, i would seriously make something for the time being, maybe out of a tub, they are pretty cheap and a heat mat with the thermostat. Its in their best interest.

UPDATE:
So, the trip to the vet was immeasurably expensive for me. 250, which thankfully the roommate paid for. but, the fluid was clear and not stringy, so it was caught early and its healing well. Also, they're giving her antibiotic injections, but are doing a culture to find out if a more specific type is needed, which will be even more expensive. She weighed in at 100 grams, which, for her age is bad, but I can't do much there. Except feed her more often which would be bad also. so. Damned if i do damned if i don't. Other than that, it'll just take time and keeping her happy. They said she'll shed soon and leave a big hole where to wound is, and to not freak out. but i doubt i'm going to be doing anything but freaking out when that happens, as i'm sure it'll be disgusting.