Another thing that cows will do to a new milker is they will bully you with their feet.
Is she really kicking you, or is she just swatting her foot at the machine?
There is a big difference.
If she learns that all she has to do is shake her hoof and it makes you back off, then it becomes a power-play.
I have seen this many times with people who are a bit skittish to get up under the cow.
There is a big difference between "kick your face off" and "stomp the machine off" types of kicking. I just got through training a heifer who I called "helicopter legs". She had a roundhouse kick.

After 2 weeks of hobbling for milking, she is now *mostly* pretty good.
An empty udder feels and looks empty. It is not tight and it feels like an empty bag.
It is possible that the calf is preferring one or 2 quarters and not drinking from all 4.
If so, then the machine will finish milking those ones out while the others still have milk in them.
You can turn those cups down (or put plugs in them) and finish milking the ones that need it with the machine.