Hi @Lisakae828
If she is seeing the "Waiting for the host to start meeting", that means the meeting was scheduled without Join before host, known as Allow participants to join anytime when scheduling. With this enabled, anyone should be able to join, regardless if they are the host or not.
Since that was not enabled, Zoom was waiting for the host of the meeting to join first. If she was logged in and still getting that message, it could mean that you scheduled the meeting with your Zoom account instead of her's. To confirm, check the meeting ID on the calendar invite and see if you see that same ID on your Zoom account under Previous meetings.