11.5 year old daughter still no signs of puberty

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.