Respiratory infection

I have a 3000gram female that has a respiratory infection. she hold her mouth open and have flem and some blood. However she still eats fine. I dont know what to do.

Take her to the vet.

Between now and her vet visit you can increase her low/high temps to around 83/93*F, bump up her humidity so she can expel the mucous, and clean & disinfect her tank daily.

Vet asap, RI can decimate reptiles fairly quick

Do you have other reptiles? Is she quarantined away from them if so?

1) Quarantine her ASAP
2) Bump up her hot spot to 95. Don't let the ambient below 80.
3) Take her to the vet and get a culture done. Do not allow the vet to prescribe you antibiotics without a culture.