I say you have your mom call Care Bears' HQ to see if they'll send your paperwork over to My Little Pony. I mean, those rules about pledging other orgs, that's crap. No one listens to that cockamamie stuff. If My Little Pony is truly in your heart this semester, you should do it. Actually, when your mom calls, tell her to inquire about this thing called AI... she may be interested.
But, if none of that works out, there's no reason why you couldnt go to Raggedy Ann's COB events. They usually wouldnt mind a former Care Bear joining their org. Usually, though. I'm not saying they wouldnt ever mind.
Good luck!
P.S. Smurfs, Inc. is having an informational i heard. You should check it out. Wear as much blue as your can and be sure to tell them about your involvement with Care Bears - they'll be SO impressed!