Are you sure she's not scared of kicking herself in the head? I have a teammate who frequently does that
Some ideas that might help: practice a switch ring, without the head release - just getting the back knee bent. Also be practicing a switch Yang Bo; then it's simply a matter of combining.
I can definitely relate to the getting lost/having no idea how far off the ground you are feeling!
Also, check that she can do a ring split on the leg she'll be using in the switch - amazingly, I have to switch split on my other leg (to my normal switch), because I've got better flexibility in my right leg (and an insane lack of control in my left).
Ballet, ballet and ballet will also help.