WIBTA if I stopped covering for my friend when she's late to our shared morning carpool
So me and my friend "Lisa" have been carpooling to work for about eight months now. We live maybe 6 minutes apart and work at the same office, so it made sense, we split gas, it's been mostly fine. The arrangement is I pick her up at 8:10, we get to the office by 8:30 which is when we're both supposed to be in.
The problem is Lisa is late probably three times a week. Not like two minutes late, I mean I'm sitting outside her building texting her at 8:12 and she comes down at 8:20 still eating breakfast or with wet hair. We've ended up arriving at 8:35, 8:40 a few times. Our manager hasn't said anything to me directly but I've noticed him glancing at the clock when we walk in together and I just have this low grade anxiety about it every morning now.
I've mentioned it to Lisa twice. The first time she apologized and said she'd set an earlier alarm. Nothing changed. The second time she kind of laughed it off and said "you know how I am in the mornings" like that's just a fact of nature I have to work around. I didn't push it because I didn't want to make things weird between us, we're genuinely good friends outside of this.
But now I'm thinking about just leaving at 8:10 no matter what. Like, texting her at 8:08 saying "leaving in 2 mins" and then actually leaving. She has a bus she could take, it's not like she'd be stranded, it would just add maybe 25 minutes to her commute. I haven't done it yet because I know she'd probably be frustrated with me and I don't want to damage the friendship over something that feels small. But it doesn't actually feel that small to me anymore, it feels like I'm risking my own reputation at work because she can't get downstairs on time.
Would I be wrong to just start leaving without her if she's not down by 8:10?