Do I have to answer her e-mails?

A girl I work with was giving me a ride into work. This went on for almost two years. Two weeks ago she had to move out of her apartment because her, her daughter and her son-in-law didn’t pay their rent. She has moved almost 7 times in tha last 2 years because she doesn’t pay her bills. She moved in with another lady from work and that is about 60 miles out of town. She gave me two days notice that she was moving. I do not drive (never learned how, would rather eat a live spider) and that left me in a real bad bind. Just today I got my ride situation worked out with a man here at work. He lives about a mile away from me and said it would be no problem.
I am still very pissed off at her for not giving me any more notice than she did. She still e-mails me every day like nothing happened. I have bitten my tongue on several occasions. Do I have to respond to her or is it ok to just ignore her?