First and only period

So my daughter is 13 and had her first period a couple months ago but that was also her last period. I’m planning to take her to the doctor because I’m not sure if that is normal. at first I thought since it was her first period and it threw mine off. I thought maybe since as girls our periods link up I thought maybe it was something like that happening but now she still has not gotten one since. Has anyone been through this? Is this still normal since she still young? I ask because when I got mine at her age I had it monthly since. Should I be worried?