I take it a bitch like that can spot a geek a mile away? In which case, she'd probably leave Grandma alone and go fuck with the geek. If you can't hide your geek nature, perhaps try to make yourself look like a dangerous geek, the kind who might bite your head off if you look too much like a chicken.
I'm saying this because a company in that town called me up this morning, in response to an app I sent in. I may get called again soon for an interview. If I get that job, I might find myself having to take those very same trains to work every morning.
I've heard worse things can happen that will make you wish it was just some crazy bitch screaming hip-hop lyrics at you.