Retic (Esmeralda) not Feeding

[guyabano]

Hey guys, what do you usually do when a snake goes off feed? Last time she fed was about a month ago, right before she went pre-shed blue. She shed on a Saturday so I tried feeding the next evening. She didn't take it after an hour, so I took the rat out and went to bed. I tried again three days after and I observed the most peculiar behavior.
Usually, I open up the enclosure and she goes for one of her hides but leaves her head out. She sees the rat, stalks it and takes it. This time, she stalked it, direct movement, quick tongue flickering but then she just froze 3 inches away. Didn't move for a couple of minutes and she just turned around and went to the other side of the enclosure. Tried it again the next Sunday, same thing.

Since then, I've left her alone and skipped the Sunday after that. I plan to try again tomorrow. What do you guys think?

She seems to have lost some weight, but I keep her hydrated.