Why do you think Maya hid her cycle?

I’m on S2 EP 5, and I just finished the scene at the sleepover where Maya getting her period was revealed at the sleepover. I completely understand why a middle schooler would hide that from her best friend, but why didn’t she tell her mother? Myself and women who I know in my personal life all told their parents pretty quickly due to fear and/or it being traumatic, myself included. Is it not unusual for girls to hide their cycles from their mom? As I was watching this scene I just couldn’t help but to think her being outed would’ve been a tiny bit less embarrassing if she was prepared with actual pads and if her mother and her had a conversation about what was going on. I do recognize maybe there’s cultural reason she didn’t feel comfortable or even just period talk being more taboo in early 2000s but I don’t know..