I see no problem with your temperatures based on the (albeit little) information provided. I think it is unlikely that a temperature modification of a few degrees will change her feeding response. I have had this happen when a snake will spontaneously stop taking F/T, but will then take anything offered live no problem. You can try the following:
(1) The first thing I would try and is warming F/T and placing inside her hide box. This will often times get picky snakes to take it.
(2) If this does not work, you can try "re-training" the snake. What I mean by this is offer her a live meal this week, and presumably she will take it. The next week buy another live feeder and let it sit out near the enclosure, this will sometimes get a snake "excited" about the prospect of a meal. You should then scent the F/T feeder with the live animal and see if the snake will take it. If she won't, offer the live food, then offer the scented F/T item after it.
(3) Alternatively, you can let the snake fast for a week or two and keep offering a F/T once a week on feeding day.
This is not a quip at you personally, but is there a sticky for "tricks and tips" on switching feeders? I feel like we see this question all the time and if you search the forum and YouTube, there are many videos and tips you will find there.