Use glue in the ER all the time but where thats at might be dicy you need some monofiliment and a curved needle also 2 forceps knot is easy look it up on the web 3 inches soundl like 12 stitches also irrigate that out with some saline and then and antibiotic if its that deep NO NEOSPORIN TILL ITS STITCHED.. Pull the stitches in 10 days also I see you have other chickens and a roo keep her away theyll pic at her... Now for the fox go to the predater thread or PM me about electric fence and some tricks to deter madam fox from comin around... you could try coyote urine they sell it at nurseries in powder form fox with kits will avoid coyotes of course you could attract a coyote... Your gonna have to pen the flock she has kits to feed shell be back and the reason she didnt take the others is you or someone else spooked her...