New Roommates seeking advice...?

My roommate and I have known each other since high school (almost 15 years). We have been sharing a house together with our boys (I have a 6 year old and she has a 4 year old) for about a month. I don't have a car so I usually take the bus to and from work every day but since we moved in together, she has been driving me back and forth to work everyday. I give her $50 every 2 weeks for gas.





Last night I came home around 10:30pm (after being away from home for 4 days) and she was already in bed for the night. She left a letter on my bed stating that she will no longer be driving me back and forth to work everyday. She says the reason is because it takes too much time for her to drive me to and from my place of work and that she should be doing other things for herself like preparing her son's breakfast or dinner or for going to workout at the gym. This I understand, but what I don't understand is why all of a sudden this is an issue for her.





I haven't had a chance to speak to her about this yet and I really don't know what sort of approach to take. I understand what she is telling me but why didn't she speak up sooner? Can anyone help me out...I really don't know what I'm supposed to say in this situation.New Roommates seeking advice...?
Just say ok and start taking the bus. She is being passive/aggressive. Acting like it was fine to drive you and then up and changing her mind and not even telling you, but leaving a note.New Roommates seeking advice...?
Just tell her okay, thanks for taking me the last x number of weeks. It really is a lot of trouble and takes up way too much time.
I would say:


No problem, I understand, t does take a lot of time.


I'm glad you let me know before it became a problem. As roomates, I'm glad we can talk about stuff.
Maybe at the beginning she thought she would be able to fit into her schedule, best think to do is sit down and found out what has changed