Oh yes, Ash did mention! When it comes to biting. It might seem silly, but you need to 'Yelp' high pitched squeak. This is what a litter mate would do if it was bit too hard. The mother would normally separate then - you can kinda simulate 'separation' by without holding attention for a...
Watch out, I may have to kidnap her! I would watch videos on youtube. I know particularly 'working dogs' need 'mental stimulation' or they'll go nuts. This may be less of an issue because she's a mix but in time you'll probably know.