There's lots of topics here already that might help you with that -- I'd try clicking the "search" button up top and typing in "pee on bed." I'm sure you'll come up with tons of results -- lots of people here seem to have that problem unfortunately.
She is so lovely.
About the peeing in the bed problem you can start a thread in Behaviour. It could be that she doesn't like the litter or something else is stressing her out. If you give details I am sure somebody here will figure it out.