My dog ate a bone

So my six pound chihuahua got ahold of a bone, I’m not sure how as I’m super paranoid and am always watching her. Anyways, I’m out out on the deck and I just hear ‘cRUNCH CRUNCH CRUNCH’ I get her to drop the remaining bit but I’m A. Not sure how big it was B. What type of bone it was. HELP!! What should I do???