Who I have the same questioned this topic

I am hoping someone can help me and my daughter.  Yesterday, one of her friends played with her phone trying to get into it.   They must have tried too many times and the phone reset itself.  She has a Samsung galaxy s5 phone.   We were able to get her contacts and messages back but can not find her pictures   If I go into setup/accounts, I can find her email address but can not determine how to get it to run the back up restore to see if the pictures are recovered.    I thought this was sufficient to retrieve items when lost on the phone.   I now set up the phone with the cloud.

Any recommendations on what to do.....

Thanks