As previously noted:
Lock the car w/the keyfob. Then to get out, you press and HOLD the central unlock button on the dash while you pull the interior door handle to unlock.
OK, I just tested this and it does work
. You can lock someone in with the fob, and you can get out as described above. Of course, not recommended, but good to know.
The suggestion to have her use the button to lock/unlock herself is probably the best solution.