looks like what happened to my Male jackson... but it wasnt mouth rot. what happend to him was a leg of a cricket cut his mouth and it became infected!
only reason i know this is cuz i went to the vet...
From the looks of it, could be a temporal gland infection. This rarely leads to generalized problems so she could have other issues if she is lethargic and not doing good. I agree a Vet visit is in order ASAP to make sure she stands a chance at recovery.
If you can shed some more info as to the progress of the problem from beginning until now it might help too but a hands on examination by a vet would be the best option for her.