Possible B12 connection to uncontrollable chewing behavior in a child

Over the past three years, I've read a fair amount about different forms of vitamin B12 (cobalamin). I discovered early on that one of my toddlers seemed to chew her hair and other things more after taking methylcobalamin. So I didn't give it to her. After all, this was a child who would sometimes chew on the wooden TV stand for no apparent reason.

Last night we had homemade mock haggis for dinner because we're learning about Scotland. Haggis is basically minced liver and onions combined with meatloaf. We don't make a habit of eating liver because I don't like the taste. But the toddler with the strange reaction to methylcobalamin actually liked the haggis and ate a lot for her size. Later in the evening, I noticed one of our pillows had a large wet spot on its corner. Then I found a wet, chewed hairband--we don't own a dog. This little girl turned out to be the culprit. She was so caught up in chewing that she had also started gnawing on her wallet, which she loves. Liver does contains methylcobalamin, although it seems to be much higher in other forms of vitamin B12. (See https://www.cambridge.org/core/services/aop-cambridge-core/content/view/D0391C340D6A638D1A5C86F60EB83129/S0007114576000147a.pdf/forms_of_vitamin_b12_in_foods.pdf.) I'm curious whether there's a causative link between high B12 intake and her occasional outbreaks of gnawing. Not curious enough to give her a hydroxocobalamin capsule, though. I don't appreciate her slobbering on the furniture.