Bought a new phone, daughter reset it and can't login now...

I bought my daughter a motoE, and she setup a gmail account, and then a month later she reset the phone. (my other daughter, an iphone user told her too when she forgot her login).

Now, since my daughter can't even remember the gmail account she used to login, because she created it just for the phone, and never used it on a computer, she can't get back into her phone.

What can we do??? I've looked all over the internet. Tried logging in dozens of times over the past few months, I tried...

Bought a new phone, daughter reset it and can't login now...

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