Re: swimming pool and pee problem
Put her in little swimmers -- swimming diapers. At our pool any child that isn't potty trained is required by law (health department) that they wear them and if you don't have any, they sell them to you for $1 each.
DS is potty trained, but even before he was and wore little swimmers, he knew not to poop or pee in the pool (and bathtub)
As for getting cold -- when she gets out of the water, make sure you have a towel to wrap her up with right away.