91 in a small enclosure like I mentioned is actually too hot leaving little room for proper thermo-regulation since the space is much tighter, and need to be able to "escape the eat if they feel the need to.
If the snake is hiding it really depends some do fin if you lift up the hide and offer food some do not, which is why I would encourage you to have a strong routine, feed the same day every week and have the food near by their enclosure for 30 min to an hour prior to feeding, this is called scenting and it help entice them and get them in feed mode, which at that point they will either be outside of their hide or right at the entrance.
It seems like a lot at first but it gets better as they settle down and get older.