A friend of mine in his 50's when kidding around will say, "Ill beat you up". I reply , I hope you have fun in jail with your your cellmate as it is a felony to put your hands on a senior citizen.
Seriously, I would never allow anyone to put their hands on me an unfriendly manner. I think letting her know this is unacceptable and reporting her, should be your next steps.
Some people think they have a sense of entitlement in TV. This person needs to be set straight.
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"It doesn't cost "nuttin", to be nice". 
MOM
I just want to do the right thing! Uncle Joe, (my hero).