My daughter turned 13 and was allowed instagram for the first time. Within days, she was on it every possible moment and within a couple of weeks she was sharing screen shots of ads of aggressive diet and fitness regimes. She saw self harm and eating disorder posts without searching for them. It wasn’t long before she started exhibiting early signs of both things herself.
After discussion, we banned instagram and she returned to her previous happy self. I have no doubt that instagram is actively harmful for your girls and women.