Have her see a certified strength coach.
Theres a pile of different factors going into this one: you already have noticed asymmetrical weakness. Poor biomechanics also occur from sitting at a desk in school (damn near child abuse in my opinion, now that I know how bad it is for us). Pelvis function is connected to scapula, scapula to shoulder etc. etc. . She may simply need longer to develop. May need diet adjustments. Will absolutely need a proper exercise plan, without it (see: just turning down the bow) she will limp along with self developed muscle compensations until something gives because it’s not working right.
This is a setup for life long pain and injury.
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“Nothing is more persistent than a liberal with a dumb idea” - Ebrand
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