Unfortunately no official diagnosis since she claims nothing is wrong with her and everyone else is out to get her instead. But I suspect narcissistic personality disorder and potentially ADHD (she's extremely impulsive and makes/changes long term plans on a whim).

We also had about 20 or 30 car seats all together (including both the infant and toddler variants) and we split up shortly after the kid's first birthday. The winter she was pregnant, she complained about winter jackets being too small or too cold every few weeks, think I bought her a total of 10-15 jackets over one winter. Couldn't get one two sizes up either. Had to be exact fit because "I'll stop growing now anyway". She did not. Went from 70 KG to peak 140 just before birth, claiming she ate nothing.