The clicking/popping sound becomes continuous if I compress thumb and fore finger by about 3mm , 3cm behind her head. I also noticed a droplet of what seemed to be water at first, when I touched it however it was sticky .

Call me a hypochondriac but I think I'm going to take her to a vet and get her checked out, Especially since I may have a new garter snake on my hands very soon, I don't want to put them both at risk.
I may just be over reacting but I always think its better to be safe than sorry.

Any thoughts?