My daughter is 11.5 and has absolutely no signs of puberty yet. No breast development whatsoever and just absolutely no indicator of anything starting.

Should I be worried ?

*** Edit ***

At her 11 year annual checkup her doctor expressed mild concern that she had no signs of puberty but didn’t want to address it just yet. I hoped/assumed she’d start showing some signs by now as it’s been 6 months and I started my period at 11 and so did my mom. I am going to reach out to her doctor tomorrow but I’m stressing myself out thinking there might be something wrong.