Late periods

As a *non active* teen, when my period is late I always freak out and think I'm the next Virgin Mary lol! Even if it's summer, it can still be stressful, as so many things are changing and people are all weird and everything is either cool or stupid! A girls period won't normally even out until they have had it for 4-5 years (if you need some advice or if she wants a place to look for advice scarleteen.com is great for me!)

Good news! She got her period. Thanks for the advice.

I've been menstrating for 11 years now and have never had a regular cycle. I've gone up to a year without a period. I could have it a few months in a row usually then skip a month or 4 months. I believe it's just a hormone imbalance so I'm not too worried. Never had any health problems except for that and I'm not one to complain about a skipped period lol. I'm sure your daughter will be fine unless other problems rise up. 

When I started my period I didn't get it for 4 months. I doubt it's anything serious. 

A change in diet can affect your period too 

Has she been under any stress? Stress is a main reason to delay periods especially with teenagers as those years can be stressful at times. Also changes in diet, exercise and weight can affect your period as well as being sick recently or certain medications. How long has she had her period? If not long it could still not be used to being regular.