Hello first time poster. More looking for advice on a work situation. A girl in work was stuck for a lift a few weeks back to the bus station. As it was on my way I offered. Now the last few weeks it's been at least twice a week and then a full week here and there. I didn't really mind as one offs but I'm starting to feel a bit put out.
We work 3 varying shifts patterns and the other day she informed me she has asked management to change her shifts so she can be in the same as me so she can have a lift. That would mean I'd be giving her a lift for nearly 2 and half weeks straight and i don't really want to. I just don't know how to get out of it now. It's on the way but it's my only quiet time and I feel like it's just been assumed it's ok. I really just want to say sorry but I can't but i don't know how to politely. The other day I had to take my boyfriend to work so text her the day before to say sorry I couldnt give her a lift and she planned out my route to say that if I went earlier I'd still have time to pick her up and if I didn't could I still give her a lift back? She also asked if I could let her know a week in advance my plans so she can plan her travel. I get it but I don't feel I should have to give someone my schedule and then be tied to it. Any advice would be much appreciated.