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I'm quite concerned that she came from a pet store. Pet stores really aren't good at all, no matter what people say. So many things going on, so much stress for dogs, imagine being picked up by a different person every day, people peering at you in the glass window.
Unfortunately you can't tell if she'll be aggressive, not without the genetics/parents. I too think this sounds like play growling and nothing to be concerned about but something you should do is to teach her to share her toys/food with you.
For example you produce a low quality toy, something she doesn't really care about. Give her a command e.g 'Give' and remove that toy. Praise her and produce a better toy (but not much better) and keep going up. When you reach the highest value toys (hopefully she'll have caught on..) then reward her with food. Don't let her know what she'll get, it's a game to her, 'If I give this up, I wonder what I'll get'
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