Since the eye drops are doing little to treat Xena's eye; we're pretty certain our vet will opt to perform surgery. We will know more by Thursday, when Xena undergoes a re-check.
Our vet explained cherry eye occurs when the tear gland behind the third eyelid moves out of place. Surgery will relocate the gland behind the eyelid.
Cherry eye is known as a "collapsed gland" of this third eyelid.
Our vet will create a pocket for the gland & tuck it into the pocket. If Xena doesn't have the surgery, she will develop dry eye - which would require drops every day for the rest of her life. And we don't want that.