How can you access phone when forgot password with out restoring device

You can’t. You have to erase it now in order to use it again. You can restore a backup after you get into the device. But my guess is you wouldn’t be worried about restoring the device if you had a backup

If you forgot your iPhone passcode - Apple Support

So if you don’t have a backup, you will have to start all over again.

Face ID is just a secondary “unlocking method.” Anytime anything fishy, or unusual is being done with the iPhone, ex. Restarting, updating, wrong Face ID too many times, etc., the iPhone will always have you use the passcode. I guess better security.

We’re sorry to hear that your daughter is going to loose photos that most likely mean a lot to her. Hopefully you will find that the iPhone was backed up.