My mom deleted some photos from an iPhone 7.
She deleted them via Windows Explorer.
There is no backup as she took them just a few days ago.
Is it possible to recover them?
iPhone spec: iOS 10.0.3
In short, no.
Recovering files deleted from an encrypted hardware device is generally considered not possible, especially as they didn't go through iOS Photos' own deletion system, which would have kept them for 30 days.