I can't speak to your daughter's specific problems, but since she has gut and, possibly, renal disease (given her diabetes)...
The complications of chronic hyperglycaemia take years to develop, and T1D develops fast. There's no way a newly diagnosed T1D would have renal complications at the time of diagnosis, never mind a year earlier.
I haven't seen any human data on this, so please share if you have, but in animal models of T1D, impaired calcitriol conversion occurs within days of the onset of diabetes. If they had to develop renal failure in order to have impaired Vitamin D metabolism, then I would agree that the timecourse makes no sense.
The complications of chronic hyperglycaemia take years to develop, and T1D develops fast. There's no way a newly diagnosed T1D would have renal complications at the time of diagnosis, never mind a year earlier.