Posting a picture would be the only way to say for sure...
Gravid rosies will sometimes refuse to feed while gravid. I have some that feed all the way thru, some that refuse all the way thru and some that are in-between.
I wouldn't worry about it too much. Just try smaller than normal food items.
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Thanks,
-JC
www.rosyboas.to

40 plus rosies
0.1 Boa constrictor
1.1 cats(bengal & bengal mix)