Mom just replied 3hours later "I'll come by to drop it off in the morning, if you aren't home, I'll leave it for you somewhere".
Should I discuss anything with her tomorrow (if I'm home)? Tuesday morning at drop off pretend like nothing happened?
Definitely bring it up. It NEEDS to be discussed, and shouldn't be hushed away. You don't need this to happen again. I know you said you don't like confrontation, neither do I, but people have to understand why we have these rules and regulations! Good luck!