Default [Q] Reinstalling a Nook to yesterdays date

My daughter handed me her nook today, claiming she didnt know what had happened to it. Shes only 8. Anyways it was acting as thought it was brand new and I was having to pick all the factory settings. I thought when i put her gmail address and passowrd init would bring all her games back up but it said it was not a known email address, therefore i had to create an acc giveing her name etc again. The Nook is now all fired up again but she has lost everything, and when i say everything they were all free kids games but I woudl think the Nook would backup the contents and I was wondering if there was anyway I could get it to log in from the most recent backupdatefrom yesterday or previous to that.
I am not technically minded in the slightest and ive tried to read other comments but when it gets to rooted and stock restore etc i get totally lost ! Can anyone help me please ?