Sorry I don’t mean to sound rude but your PD knows better and you should bring it up to him/her for better advice since he/she is the professional, rather than a bunch of anonymous ppl online.
your pd has already advised you so probably you just need to give her more time? Eventually she will be able to walk independently
My elder LO started to walk independently at 19mths. it is normal. no worries.
norm for my kidz