Hi - welcome to YT and congrats

!!!
Your pup is very young, so keep a very, very close eye on her; usually, they stay w/ their Mom until they're 12 weeks old...so this makes your pup a little more vulnerable. Don't change foods or anything like that. Have Nutrical on hand, just in case.
Potty training is a big subject and we have some really great sticky threads on it, in this section...read those:
General Training Questions - YorkieTalk.com Forums - Yorkshire Terrier Community