You’re not doing anything wrong, each kid develops different things at different paces and that’s okay. My son was 14 months when he started walking. He seemed to practice falling down and picking himself up a lot which I found odd and interesting, but his pediatrician at the time was like he’s fine. I had a friend whose daughter was 20 months before she took any kinds of steps and she’s pretty neurotypical. If you have concerns, I’d definitely ask the pediatrician what they think and maybe get PT/OT involved if they think it’s a concern.
Every kid learns at their own pace. She’ll get the hang of it soon, is your pediatrician concerned? If their not then I wouldn’t be either.. but you can always talk to your pediatrician about it.