Another non-pooping snake question(s)

Okay, I'm starting to get a little worried. I have a female BP that hasn't defecated since May 4th. She's eating every week, shed once a couple weeks ago, and seems pretty content. I gave her a lukewarm bath twice, but no results. The only semi-strange behaviour I've noticed is that she doesn't seem to roam around the cage as much as she used to. Most of the time at night she just has her head peeking out of the hide when before she used to roam all over the place.

Now for the questions: What point should I start to worry? Is a compaction or constipation really obvious? Should I continue to feed her normally or wait until she does finally defecate? Where can I pick up Python Metamucil or at least Snake Bran and a cup of coffee? :P

Is she drinking water normally? I would change the water every night just to be sure it is fresh. Even water that is just left in the tank for 2 days, starts to get yucky sometimes.
Otherwise, I am not sure. Maybe someone else will chime in.

I haven't seen her drink in a while, but her urates seem to be fine. She's passing urates about once every 10 days or so. I change the water almost every day, but I never wait more than 2.

Wow kind off topic but just like 1 hr ago roxy just took 2 monster dukes and no wonder there was a long bup in her tail.