How do fluorosis and enamel hypoplasia relate to each other?

Hi doctor,

About nine years ago, my friends and I did moronic stuff. For nearly a month, we inhaled duster, which is difluoroethane or something similar. I do not know how many cans I used, maybe 20. I recently read that it can cause fluorosis. We also drank Listerine twice, which may or may not have had fluoride. I did not have signs of fluoride toxicity at the time that I can remember.

Flash forward to two years ago, I had a baby. I became obsessed with the idea that I had skeletal fluorosis nine years ago. During regular bone remodeling in pregnancy, I worried that I had poisoned her with fluoride from the exposure seven years before she was ever conceived. She is fine, but she developed enamel hypoplasia, she was a bit premature, and I had a rough labor. She also had a few high fevers as a little one. It is not on all of her teeth; her front four teeth are affected, not too severely, and her molars have slight to moderate hypoplasia or hypomineralization.

I had a fluoride urine test while breastfeeding that showed no fluoride present but low creatinine, which is 13 mg/dL, so I feel it cannot be trusted, even though I would have been having bone remodeling at this time too, which is nine months post-birth. The specimen was probably not dilute. I had just lost muscle recently from terrible anxiety. I have OCD, and even though her dentist has reassured me, I am obsessed with the idea that I caused her enamel hypoplasia. I have no evidence I ever had fluoride toxicity except for my past exposures. Please tell me if this is irrational or could be a cause of her hypoplasia.

Please help