Legal Advice

Why didn't you either take the time to bring the envelope over or at least shell out for priority mail and get delivery/signature confirmation?

Also, the reason you're supposed to give 30 days notice is so they can find a new renter for the apartment. If you just tell your landlord you're moving out tomorrow, you are shafting them out of money since they won't have ample time to advertise and fill the place they're renting out.

Also, just because she owns the place doesn't mean she isn't losing money. She still has to pay all of her taxes and everything on the property (a pretty decent chunk of change I'd imagine for your area), so by not having the place filled (income she'd expect), she is actually losing money.

Also, I imagine people growing pot in the house really won't do much for you in small claims court, since that's not any of their business. The court would care about your legal responsibility to the contract, not what her kid was doing in the house. Not to mention how it took you until now to bring this infraction to the attention of the authorities, so they probably would figure you were pretty complicit in the growing/using of the plant.

Jam it back in, in the dark.