I feel you. We have the same problem in tropical storm season (hurricanes). The rain comes in bands and you have to be quick to pee and get back inside. Maybe you could pour a bag of sand or kitty litter in one spot for her to use outside where it won't get so wet. Raina loves to be wet but I don't love her to be wet when she comes in the house!
Snake Vom Eselspfad RN CGC (AKA Raina) 3/5/08
Pyrate CGC 4/1/03-5/16/12 RIP
Too many to list waiting at the bridge but remembering them all