I don't know about longterm effects on her overall growth, however, there could potentially be issues with her.

What I mean to say is, my boa acts VERY odd. She doesn't have good balance, at all. She flails around alot if she doesn't feel secured in place (meaning, if her tail isn't wrapped around my bra strap or wrist, she throws her tail around until she gets hold of something and puts a death grip on it). It's like she's constantly dizzy/clumsy/unable to balance. I have a hard time taking her off of me because she'll wrap her tail around some part of me and not let go. The only time she's happy and calm is if she's secured in a spot and knows it. Each time I pick her up out of her tub, even if she's coiled up and I try to grab her in her little bundled up state, she'll immediately thrash her tail around until she secures it somewhere on my hand. =/ It wasn't so bad when she was still extremely thin, but now that she's got her strength back, it's a little disconcerting because she puts a death grip on whatever she grabs hold of to secure herself lol.

The reason I don't worry, is because she's healthy in every other way.