I think you are entirely right to be concerned. Six x-rays and wanting to do still more to a child whose bones and organs are still forming and developing? To me that is just way too much, given what you have described.
If it were me, I would give my child loving care and good nutrition, make sure she gets plenty of vitamin D and give her some potassium iodine to help offset the effects of the radiation. It might also be a good idea to have her take small amounts of oleander (perhaps half a capsule ever other day) for awhile and add a bit of curcumin.
I think that the product IntraKID (which is a version of IntraMAX made especially for children) is simply wonderful. To help insure proper bone repair and growth, some extra silica should serve her well.
This is just my opinion, but the last thing I think she needs is further x-rays and getting into a cycle of managed illness, where one doctor refers you to another and you get tests and x-rays at labs owned wholly or in part by the doctors and then possible medical procedures and medications which may not be necessary, etc., when there is every indication that she is already on the mend.