Menstrual Cup for pre-teen

My daughter (12) had her period for the last half year. Now that we are planning summer holidays on the beach she is worried as she calculated to have her period exactly then, and we can’t change the date.

She is usually using pads and had quite heavy periods.

I myself am using menstrual cups but they are quite big. I searched up the smallest ones on the market but they still start at 30-36mm diameter which seems very big for someone her age 🙈

Have any of your children tried menstrual cups or any advise?

xx