Bci help!!!

[Bci]

Hey guys I'm new to this forum and I just have a few questions to ask some other snake owners. I recently bought a boa constrictor imperator(3 months ago) and have been doing great so far. I feed her every 7 days but ask thinking of maybe making more time before feedings not sure maybe you guys could help with that too? She is about 27-30" last shed being 27". My main concern is... in the past everytime I fed her, about 2-3 days before the next feeding I would find poop but for the past 2 feeds I haven't been able to find any poop in her enclosure and its starting to worry me if anyone has any advise I really want to hear it! Her new tank I set up about 2 months ago is a 6'×2'×2' fish tank that I built a wooden and screen mesh top for. It is bio active with all live plants. She has 3 hides(warm end,middle, and cool end) and a large enough water dish to soak in. She spends about 60% of time in that water is that okay? I have a repti rain system to help with humidity as well as I mist 2 times a day.

Any help at all would really be appreciated as I love caring for this amazing reptile and just want to give it the best I can!

All food I feed her is the same size as her widest part of body and always frozen thawed for anyone wondering.