The home, which was run by an order of Catholic nuns and closed in 1961, was one of many such institutions that housed tens of thousands of orphans and unmarried pregnant women who were forced to give up their children throughout much of the 20th century.
In 2014, historian Catherine Corless tracked down death certificates for nearly 800 children who died at the home in Tuam between the 1920s and 1961 — but could only find a burial record for one child.
I don’t think her switching religions had a detrimental effect on her mental health. Probably quite the opposite. And it really doesn’t matter that she switched from one mainstream religion to another mainstream religion. It’s not like joining an offshoot’s going to be any better or worse. She was seeking peace. Maybe she found it, maybe she didn’t, that’s for her to decide in whatever afterlife she ended up in.
Did you check at least the health section of her Wikipedia page?
It did not help and she clearly hasn’t found peace.