Dog Teasing Owner?

She's most likely trying to entice you into play. If you watch dogs play with each other they will frequently exhibit such behavior, trying to get one to chase the other.

If it bothers you though, you can always teach the Leave It command (it's a good one to know, anyway) so that your dog will drop her toy when asked.

Wolves (or wild dogs) also don't typically weight significant amounts more then their counterparts. Not all dog/dog behaviors can be applied to a dog/human relationship.