I'm no hognose expert, but if she has grown that much, I dont think it would be unusual to get a food refusal due to an oncoming shed. Since you didnt mention a shed, I would guess that is likely after than many meals even if your scale was off somehow.
The only things I know of that are pretty regular about eating in shed are corn snakes and king snakes, so if it is an incoming shed then it isnt surprising to get a refusal.
Aside from that, I'll leave any other suggestions to someone who is more familiar with the species.
Sent from my SM-G950U using Tapatalk