Don't waste your money on the security shit.

She already got her revenge.

This is what you should do:

Call the dude you stole the pills from. Give 'em back if you still got 'em. Apologize. You don't have to explain anything. That's it. Wear the keyed car like a badge. She'll find out you apologized. She doesn't care if that dick asks her to babysit again. She'll find out you aplogized and then she'll want to apologize for what she did. If you do find yourself pilfering again, try to use your head a little.