should i let my 11 year old sis in law use eve to track her symptoms?

He mother wont talk to her about anything relating to her period or anatomy and she doesnt even know where babies come from. Ii believe she is too old to be this naive and if nobody is there to amswer her questions or show her were to find them, there is going to be a rude awakening for her. She hasnt started her period as of yet but is getting symproms I believe and i want her to be able to track them and see the trends of her belly pain and irritability.