Yeah, it's disabled by default. Um, I don't know then, I'd have to google some. Is there any part of the screen that can function? If part of the screen works, you could tip it sideways and try landscape mode to unlock it/turn on USB connectivity.
Did her photos backup into google? By default lots of stuff could be dumped into her google account it usually asks when you setup the phone and people just hit yes/backup without thinking then never go and get the backup that's sitting somewhere in the cloud.
Can you run adb commands on it from a connected PC? Did you ever enabled USB Debugging?