PLEASE HELP!: Paint remover and plastic

I'm on the verge of tears and writing this with 5 minutes before I have to go to bed. We tried a new paint pen from Michael's today to paint Bill and Ben's running boards white/grey, and it bled through the tape a little, and when I was trying to scratch it away, it turned out that it had dried super fast, and removing it removes the paint underneath too, and now there's a huge area on the right side of Bill or Ben, don't know which, but thank God it's only one of them, and it's now pretty much ruined if there's no solution to removing the paint from the paint pen. The brand is Craft Smart, and it's a fine-point white paint pen. Mom will certainly never buy me a new one of this, if we can even find one. I'd really like a solution by tomorrow, or please, please let there be a solution that would work no matter how long the paint's been on..