Under 2 seems to be quite young for terming due to bully behaviour . I agree with the time by herself if you are going out of the room but seperation doesn't teach !! I would suggest shadowing and keeping her close to you . If she goes to push I would be close to change her response ! I verbalize a lot , no no no hands are for clapping kind of idea , we are nice to our friends !!!
It will take a lot of one on one but I think as her verbal skills improve the behaviour will too !!