I'm new, so I don't know if something is broken or if I have something set wrong. Child lock is OFF. I turn off the car and my daughter can't open/unlock her door in the back (passenger side). Do I have to press unlock on my door to do it?

 

Rear door child lock is manual: Long as the manual setting pin for the child locks in the rear is correctly off you should be ok

for locks in general - Have you got strange settings for locking - Do you have comfort access? Check by looking at the manual (pg.42). Under "settings", then "doors/key".

When was your car built? could be one of the brexit specials where once brits leave the back doors they cannot get back in. Whats the serial number?