Best time to train her is when it's time to eat. Have her sit nicely before you put the food down. When you go out to play, bring some food in your pocket and reward her anytime she comes to you. Don't call her, just wait for her to come to you. Most dogs don't listen to words in the beginning, anyway.
I've never had a puppy that young, so I wouldn't do more than a few minutes a couple times a day. But you can make training a game. If she looks at you, praise and treat. When she comes, praise and treat. If she's doing something bad, find something to distract her and say "good girl".