Hey, Aja!!

My girlfriend is about 20lbs lighter and 1" shorter, she wears 10oz gloves (when hitting the bag and mitts). That would be a good size, but I would say that you could throw 12oz no problem (and develope some more power/speed in the process). It's all a matter of what you're looking for. Lighter gloves are more fun because they're not as exhausting, but bigger/heavier gloves give you a better work out. For bag work I would recommend 12's, just to help you develope. It'll wear you out faster (and probably hurt a little more), but you will quickly get stronger/faster. For sparring I would recommend 14oz gloves, just for safety sake. However, you could get away with 12's even for sparring. That just seems to be the ideal number.

Hope that helps!