My sisters phone screen completely broke how can we retrieve her photos?
iPhone 6
Question marked as
If she had iCloud Photo Library turned on, the photos will be in the Photos app at www.icloud.com and she can download them from there. She can also automatically sync them to another device by turning on iCloud Photo Library on that device. See: iCloud Photo Library - Apple Support
The other way that photos may be on iCloud (if you don’t have iCloud Photo Library turned on) is via a backup of an iOS device. The entire contents of a backup can be restored or used to set up another device. See: Restore your iPhone, iPad, or iPod touch from a backup - Apple Support