I can buy that.
Idk how strict Mormon her family is.
My mom is Orthodox Christian. not too strict, but pretty devout. Technically canon orthodoxy is against make up and hair color. Obv almost nobody follows that these days, including my mom. She draws a line at tattoos though. And here I am, in my mid 30s sometimes thinking about getting a tattoo, looking at pictures, even looking up artists, but always stopping at just research, cause I know my mom would be SUPER disappointed in me.
If it were something more significant, i'd fight for it sure, but this is so minor that I just choose to do what she approves of (or not to do what she doesn't approve of lol)
I know that some of my friends' moms were weird about their daughters' hair. "Girl is supposed to have long hair, otherwise she's a boy..." nevermind that hair is thin and flat and could use a nice layered cut... They went with what their moms wanted for a long time. Till one day just secretly cutting it off... hair is reversible though... and it tends to change how you look, how you feel about yourself. I'd fight for that, honestly.
so I guess I CAN believe the "mommy" excuse, but I hesitate to. It reeks of "I wanna pretend to be sexy and bold but i'm chicken to change my pretty girl looks because i'm not as confident as I want people to think I am so... mommy made me do it"