How to restore an iPhone 6 to before you backed it up with another backup?

Please please please I know I probably can't possibly do it anymore but ok I'm going to calmly explain

My mom asked me to upload some pictures to the computer because she was running low on space and since she doesn't have much technology education she asked me and I hooked her iPhone 6 into the computer and there was this thing when I opened iTunes like (I know it was my fault for not reading everything but) it asked if I wanted to update and I guess I didn't read something and updated it and apparently it wasn't an update it was just backing up the stuff from my mom's old iPhone 4 because that was the last time we'd ever backed up anything and that was like a year ago and we'd never backed up the iPhone 6 and so my mom's iPhone 6 now has all the data from the old iPhone 4 and all of the data she had from her phone is not there anymore and it contained a lot of photos from the last couple of years and I know I probably messed up and I can't do anything.

Habibi

Check your mom's iCloud.com account. You might find the pictures there.

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