How to back up a disabled iPhone
My daughter Locked herself out of her iPhone. How can I make sure it’s backed up before resetting it?
iPhone SE
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You cannot. The phone can be recovered but all data will be lost. (Just think if someone else found it.)
You need a computer and it will wipe the phone
If you forgot the passcode on your iPhone, or your iPhone is disabled
video
How to re your iPhone if you forgot your passcode - Apple Support
In future she needs to learn how to backup and put in a weekly reminder, yes weekly! The ohone could also have been lost or stolen.
How to back up your iPhone, iPad, and iPod touch – Apple Support
Alternatively explore iCloud photos to protect them at least.