Is it normal for occasional liquid urine, or should I be worried and get her to a vet?


I am a fairly new snake owner, and I could use a bit of advice

. I just recently got a 1.5yrs BP for my birthday in May, and so far all has been great, she is active, "playful", and loves the attention of my family. She eats normally once a week. Her habitat is a glass tank with
Reptibark substrate, she has a log to climb on, and a hollowed log (too small) for her to hide under (need to get a larger hiding spot, she is growing fast!), and a bathing/drinking bowl. I have a under-tank heating pad, and I take her outside quite often during the day as well. I keep bark semi humid, but she seems to prefer it more on the dry side.
My problem--she normally poos after every meal approx. 12hrs-1 day after eating. She urinates normally (solid) about twice a week. Tonight I heard a strange noise, and looked to see that the bottom of the tank was soiled with what appeared to be water but smells like her urine. (she didn't spill the water bowl)
Any advise???