Hi,
Welcome to Neurotalk, I am so sorry about what your mother is going through ((hugs))
Some medications CAN cause mental health problems. Have you had a look at the side effects of the drugs your mom is taking??
It might also help you to post a message on the 'medications' board on Neurotalk.

Please let me introduce myself:
My name is Alison, I am 12 years old and I suffer from Reflex Sympathetic Dystrophy in my left leg and right arm.

Sorry that I can't help you further
Take care and give your mum a massive hug from me.
Alison