WIC formula question!!

Hi mamas, where I live, wic covers 3 gerber formulas. Anything else you need a prescription from pediatrician. We have babygirl on gerber good start soothe, but her gas & fussing (tummy aches I believe) are so bad no matter how well she burps, and she only produces soft poop if we mix prune juice in 2 of her bottles (doc recommends)

I go tomorrow to get new checks & I was wondering if they can put her on a different gerber formula they cover? And we get 9 cans a month however I was short this month by a can & we had to buy 1 more, will they up it to 10 cans if I tell them I need it? Or should I just plan to buy 1-2 more myself? I’m not being ungrateful just helps with my budgeting! Baby is 2.5 months old