If she doesn't seem in pain right now (and you can test this with a diagnostic dosing of pain meds...did your vet mention metacam?). Then you can continue on the way you are, enjoy each day to its fullest, and just prepare yourself. These rats can really surprise us. For example I will put up a shocking picture here of a rat I am doing the exact same thing with.
This is my 30 month feisty (read "bites in cage") rescue Bella. Her subordinate sister and she got into a scuffle and sadly Bella's eye was scratched and actually ruptured.

This was quite a while ago now (1.5 months?). The eye is dead, but with pain meds for inflammation and discomfort she is a happy little girl. She runs and plays and snatches food (and fingers if they are in her cage). My vet and I are on a treatment of keeping the eye moist 3 times a day with ointment and watching for inevitable infection. Keep them comfortable and be very very aware of any changes of behaviour that could indicate pain.
I often will try a day or 2 of metacam to see if their behaviour changes meaning they were in discomfort and then they will be on it palliatively (long term until they pass).
Forget the medical symptoms, HOW is your girl acting?