Forget about the ridiculous "constipation" thing the store employee told you about. I am betting your female is a male, and it is only interested in searching out a female. This is VERY typical this time of year for males to totally refuse meals for weeks on end until the breding season subsides.
~Doug
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"a snake in the grass is a GOOD thing" 

serpentinespecialties.webs.com

"some are just born to troll and roll"

