So this morning on the school run, I accidentally clipped someone's wing mirror with mine. I must have just brushed it as I didn't hear anything (DC's singing and chatting in the back) stopped at a set of traffic lights and the woman who's car is was started shouting through the window that i'd clipped it, I was genuinely shocked as I didn't realise and apologised numerous times, then she put her window up and drove off. I'm just not sure what to do now, I drove back past on the way back to see which house it was, and she's a parent at the same school as my DC, although i've never actually seen her before, I see children in the same uniform go into the house. I don't know if I should pop a card through her door apologising again, knock on or just leave it be. We don't live in the best area and I really don't want any trouble. Especially if we're going to walk/drive past her house twice a day.