With that being said it's likely a bite inhibition issue. While visiting your pup most likely got some lessons from mom, dad and siblings that her behavior was too rough and unnecessary. To continue that lesson at home, every time she bites, snips, plays aggressive yelp loudly followed by a no and walk away. This is his dogs teach bite inhibition and how to play to each other. Make sure you're consistent and that you're not giving any attention after (positive or negative if possible) at least for a few minutes. Visits with mom and dad and family will help as well. As long as you're consistent she should pick it up. Just remember she's very young so it's always one step forward, one step back but with patience and consistency she should learn that she's being too rough and scale it back.
All that said, this does NOT rule out potential issues with DA now or in the future. DA can rear it's head at any time or place, with certain dogs or all dogs, at any age, and sometimes not at all. Either way it's always good to be prepared for the possibility and imperative that you ALWAYS supervise any interaction with other dogs. Get a break stick, learn how to use it, and take it with you to any and all visits or where other dogs may be, even family (yours or your pups).
Good luck and keep us posted! All in all it sounds like you got some good news!