Hognose usually stop eating for one reason or another. Once you figure out why they arn't eating and keep them happy they usually eat on a predicable schedule. You may need to try a scenting technique or brain a pinkie to get her going again. Once they start eating they eat like crazy (some of my best feeders where once problem feeders for someone else).
3'x3' is to large of an enclosure. I'd personally say a 10 gallon sized tank would be as big of an enclosure as I'd recommend for a smaller hognose.
I gave a friend one of my extra males that was eating great here and he put the little guy in a 20 gallon long tank thinking he'd appreciate the extra room and the little guy wouldn't eat anything.
My buddy brought the little guy back to me, I put him in a small 6 quart container and he ate the same day. I gave the little guy back after I fed him a couple times and he now lives happily in a 10 gallon tank and eats regularly for my buddy.
I think hognose stress if they are in to large of an enclosure.
Your heat is a little on the low side also. If you don't have a hot spot of around 90 degrees I'd put a small heating pad under the tank to give them a warmer spot to thermoregulate (sp?).
Hope this helps.
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Greg Bennett - Western Hognose Morphs | Boa Morphs
520.Hognose (520.464.6673) - www.bennettreptiles.com