Spinal Muscular Atrophy (SMA) Support Group
Spinal Muscular Atrophy (SMA) is a term applied to a number of different disorders, all having in common a genetic cause and the manifestation of weakness due to loss of the motor neurons of the spinal cord and brainstem.
It's certainly understandable she's angry, I could probably help more if I knew her diagnosed type or her limitations (wheelchair electric or manual, arm strength can she still throw a ball overhand, etc...)
By knowing this I can tell where she's at in her life and try my best to convey the right advice