I'd keep a -very- close eye on her. My female never hid when she was laying. Even when she was sick she didn't hide, but she was a super friendly/sociable fish. Note the 'was'. She got a bad case of dropsy and it all went downhill. Even after all sorts of meds in the hospital tank.
If she is eating. That is very promising. If she stops eating you may want to think about trying to move her to a quarantine for observation/treatment as soon as possible. When a healthy happy fish stops eating and starts to hide, it is a very bad sign and they don't easily get over it without intervention.
If you can get a good look. Or even better.. a clear picture of her showing physical symptoms.. you can maybe get a diagnosis.
*I am dealing with such a situation with my favorite 'very friendly' Midas Blenny as of the weekend... not eating and was hiding, scared, and behaving odd.. I observed (he missed three meals and he is usually a PIG), then did a Formalin-MS dip for 45 minutes, and moved to hospital and started a course of Meracyn-2 antibiotic. I am suspecting an internal problem, but the Formalin was to deal with potential external parasitic or fungal issues before treating internally with antibiotics. If problems continue after the Meracyn-2 course for 5 days. The last ditch effort may be to try prazipro. By then if things don't improve and he isn't eating, it will probably be too late.