Yes, I’m on my third 11” iPad Pro dealing with the touch issues. There are good ones out there though..
I’ve had my 1TB 11” for 45 days now. It is perfect, and has not showed the slightest sign of touch issues, or had a touch issue ever! And the experience has gotten even better since 12.2, because that specific update has fixed the “screen protector related touch issues”
The 3rd gen iPad Pro has some issues, it seems the mass users are all fine though, with trouble free units!
Good luck with everything, I hope she gets it sorted. Once you find out it is not screen protector related, then you must exchange it.