With you being on top of the possible health issues, I wouldn't be overly concerned.
http://www.reptileforums.co.uk/forum...outh-open.html
Originally Posted by bmt87
does she do it when she notices you? if shes only doing it when she notices or senses you in the visinity then it could just be a defense mechinesm. Mine use to do it. But if its happening even when she dosnt know your there i think its vet time.

this. one of my boas used to gape like a little mare at me. However it may b an ri...and clicking? mucus?



With the telltales of RI not being there I'd just continue keeping an eye on her as you have been.
Good luck.