What can I do about a broken pinkie other than splinting it?

My GF punched a car yesterday (darn taxis in NYC bike lanes, they should know better) and her pinkie is in pain. We put a makeshift splint on it (cardboard and electrical tape). There are moments when the pain is severe, others when it isn’t. Is it necessary to see a doctor/go to the ER?

The pinkie isn’t swollen, but it feels wonky and a structurally “off.” Can bend without extreme pain. Could be hairline, could be a contusion…(and what else could it be?)

Also – what else can we do right now if we choose not to see a medical professional (e.g. icing, etc)?