New Boa Doesn't Leave Water

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hi there, i'm new and this is my first thread. I picked up an 11' sunglow female boa yesterday at the CRBE in Toronto. She was in the bag for about 24 hours due too some issues getting her tank ready. I put her in today and she checked out everything and has been in her water dish for about 6 hours now. Ten months ago i had a snake do this and he ended up infesting my collection with mites. My initial mite check yesterday turned up good but i'm worried she could have picked up mites after being out of the bag at the expo as i showed a few herper friends. I'm new to boas so i'm wondering if anyone has ever had the same issue with a BCC staying in the water. She was pretty stressed out when entering the tank and seemed a bit dehydrated seeing as she spent about 10 minutes getting in a number of drinks. could dehydration or stress be the cause? just looking for some fellow boa owner opinions. Thanks.

Dan