The h pylori meds will kill off all the good intestinal bacteria and I have read only about 70% effective. The reason she felt so bad was probably die off.
I was fighting H pylori myself for a while. I used Matula tea, double seeped the bags to extend the use of it. Followed that up with Colloidal Silver and after about 3 months I felt significantly better and havent had the abdominal pain I used to so frequent get since.
When someone starts having unexplained neurological issues I would think the fist thing to check would be the various B vitamins, they are responsible for so much. Especially B12, B9 and B3.