Both, I think.
No video shows her on the ground, or even close to it.
Videos show that Lewendowski may have come close enough to touch her as he followed Trump and scooted by in front of her, but did nothing violent or overly aggressive. He wasn’t even paying attention to her. Heck, you get jostled more walking on the streets of New York City.
There is one video where you see him reaching for her while she is moving right to left in the frame and her progress stops abruptly and she seems to be pulled back a bit. At the same moment, his movement tracks hers in a way that suggests he stopped her and held her back/pulled her. Very hard to tell how hard he pulled, how hard his grip, etc.
As a lawyer, I can say that, outside the sphere of a setting where each person is engaged in a particular role (a bouncer and patron, eg., event security and concertgoer, eg., security at political event, eg. policeman and suspect), assault is any unwanted contact. Each of the situations that permit some level of unwanted contact is a universe of its own defined by the reasonableness of the contact or force used. I have no idea how this fits on the scale, but it is probably a lot smarter for a senior campaign staffer not to do the touching in the first place. Overall, I’d say he did a no-no but its being blown out of proportion.
He fed the fire.