Sorry to Miga for the loss (and everyone else), but I seriously agree with you. You can't drown in a jucuzzi in my opinion. However, do you know if she had easy access to drugs? If so it could be an overdose, but I doubt it.
Okay, I'm about to sound like a detective, but whatever.
At about 11 PM, 2 hours before she was found dead, she called my uncle. They talked, and without my uncle saying anything when they were about to end the call, my aunt said "Love you too". My mother and I think that she was trying to get someone pissed off because they weren't giving her the things she wants (probably beer and who knows what else). Possibly, the person who she was trying to piss off drowned her in the jacuzzi, then claimed to "find" her dead. Or, it could be something like a seizure, or a heart attack. We don't know yet, it's being investigated.