Why my 13 years old daughter gets her period twice in a month is that normal is only her foth time with it

It can be very normal for a 13 year olds periods to be irregular. Especially if its only been a few months since she has started her period for the first time.

Being that she is 13 and has now started her period, maybe its time for her first trip to the gyno, and bring your concerns to him/her