Period tracker for kids

Can anyone suggest a good <a href="https://play.google.com/store/apps/details?id=com.glow.android.eve">period tracker</a> for young girls (available in android through the google store).

My daughter (11) started her period on Wednesday. I want to have her start tracking, however, she does not need all the features that GLOW has.

I have been trying to google ones, but most are similar to GLOW...or the ones for younger kids are available only on apple products. Only apple product we have at home is her school issued iPad.