I wrote out some words in buttercream on a piece of fondant for a cake tomorrow. Now it dawns on me that this might bleed before my friend picks up the cake. Is there something I can do to prevent bleeding? Would freezing it help? I was planning on refrigerating it if not, since I don't think this buttercream can sit out without spoiling.

I don't think you'll have a problem from one day to the next. Actually, I think you'd have a bigger problem if you refrigerated or froze the cake: the condensation that forms on the cake after you take it out of the fridge might contribute to the bleeding.

I'm not making the cake until tomorrow, so I hope the condensation thing doesn't become too big a deal. I just hope my friend likes the cake. I got the strangest request and I think it's turning out awful.