ignore her when she gets to nippy. honestly, my boy was VERY mouthy until about 6 months old. it was a nightmare but with consistent training methods we resolved it. i gave him a firm no turned my back to him and ignored him. if he kept on i would leave the room. after months of this he left my hands alone.
as for crating, i'm really no help because if i'm at home they would throw a fit if i left them in the crate. they are crated when i go to work during the day though and i learned Luka whined at first and now he could care less. when i am about to leave he goes in his crate automatically and is content.
good luck with your new addition!