My wife (then girlfriend) used to ride dirtbikes with me. She kinda just putted around the trails. Until, one day, she stalled her newly rebuilt bike ('80 CR250), got pissed, and when she finally got it started she gassed it way too much and did the biggest wheelie I had seen up to that time. Of course, she had never done a wheelie before and had no intention of doing a wheelie. For the grace of God, she didn't get hurt, but that was it. She rode up to my truck and said "That's it! No more dirt riding for me!".
She will take one of my kid's dirtbikes around the yard for a spin once in a while but that is the extent of it.
I did ask her if she wanted a street bike but she says she doesn't have an interest in it.
Maybe in the future.