“The stalls are in fact individual rooms (walled off from floor to ceiling), with a shared area with sinks & mirrors.”
I recently attended a race on a cold winter day where there were 40 or so portolets inside of a tent with a shared hand washing station. This worked well for this situation as there were enough people coming and going and the tent was was fairly open-air enough to make it safe.
No thanks to going into an remote, enclosed area in stores or buildings (or locker rooms!) with men next to women in shared areas with sinks and mirrors.
It is preferable to having some guy who “identifies as a woman” entering the ladies room while your unaccompanied daughter uses a stall.