The transfer may or may not be needed.
You can perform the steps above first. Once it is done, sign into your account, and go to C:\users\ and see if it creates two folders of yours. If so, then transfer is needed. If not, then no need to transfer anything.
To transfer, you need to sign in using your mom's account, then go to C:\users\your older user folder, copy and paste them to C:\users\your new user folder.