That is a good decision on her part of wean herself off those meds. The longer she takes them the more they would take over her personality and handicap her brain from being able to enjoy life without them. I'd stick by her side in this...cold turkey is rough, but in the end she will recover and will deeply appreciate your devotion to see her through this.
Or become suicidal, which I would pray is not the case and that she is not that imbalanced.
It's rough dealing with loved ones with questionable mental health. My dad is on "life-support" SSRIs - he feels juuust a little better than "I want to kill myself" and his baseline is "very depressed" - combined with other ailments + slowly developing dementia we have good reason to be concerned about him.
When I was young he used to be manic depressive and stay up for days/go on crazy exercise binges. I'm not sure if it's age or lithium or what that eliminated the mania from the equation. I do know he stopped working when I was about 6 and has been on SSD since.