Urgent - iPhone disabled, rescue data
If you've restored the phone once, the data is no longer on the device.

You (your grandma) would have either needed a backup via iTunes on their computer, or backups being made via iCloud.

If you plugged the phone into her computer and there weren't restores available, and the iPhone setup phase doesn't say it can restore from iCloud, there's no backups to restore.

However, phone backups and service data are two different things. There is a change that if you set up the phone and log her back into her Apple ID, her "live account data" (service data) would come back if they were being stored in iCloud via iCloud Photos.

Have you gone all the way through the restore process and Apple ID login on her phone?