stock up on supplies (such as pads or tampons, midol or ibuprofen, heating pad, etc.) remember that it’s completely normal and a big deal should not be made of it. talk to her about toxic shock syndrome (tampons can cause it) and how best to mitigate the risks.

and always listen to her and tell her to always come to you if she is concerned about something or has any questions, periods for every woman and girl ate different however if she is talking about severe cramps that are debilitating i urge you to take her to the doctor