Humidity is a tad high ambient humidity is more than enough for them so about 20%/30%

I won't comment on the neck issue since there is no picture.

This temperatures are a bit high I usually don't recommend higher than 92-94 for hogs even those having issue feeding, burns only occur when the heat is unregulated, the t-stat fails or the probe is dislodge.

Now as far as eating issue, it's not uncommon for some to go off feed also it is generally more common with males not as much with females.

What is the size of this hognose? (weight preferably)

Do you have at least a good 1 to 2 inches of bedding (aspen or sanichip)?

What food have you offered and how (Do you leave the prey until morning or do you use a tong and give up when she is not taking it off the tong?)

While a step backward have you try pre-scenting and if so with what?

Are you sure it is a female?