Is she a 2012 pied? If she's a 2012, she almost certainly won't be big enough this coming season. And honestly, you're not doing her any favors, trying to force her up to size before she's ready.
But if she is a 2012, sounds like she's a pretty good eater. Don't ruin that by injecting vitamins---you'll cause a health problem. Rodents are nutritionally-complete packages for snakes, who have different nutritional needs from mammals to begin with. So a multi-vitamin mix for humans wouldn't be balanced right.
And many vitamins are toxic when you overdo them. I can't stress that enough. In fact, I'm going to put it in the italic text.
I'm not a huge fan of power-feeding either, but it doesn't set off an alarm like the vitamin suggestion.
I do find my ball pythons grower slower than my friends', and I think that that's because we keep our house several degrees cooler. I think if you can keep the cool side up in the upper 70's, she'll eat more. And just offer food often, and offer second helpings.
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