Put a big cookie sheet or a larger, higher rimmed one called a sheet pan underneath.
In a cat's world, there is so little to keep them occupied & to play with throughout the day. I have long suspected that they sleep so much out of boredom rather than needing to sleep. Be thankful that a little water does the trick in helping her pass the time.
My cat likes brown paper bags. So, I have to put them all down on the floor after emptying them, so she can inspect what came into the house.
Mine like bags and boxes of any kind... one of their favorites lately is the boxes that big packs of bottled water come in. The cardboard tray on the bottom and plastic on top. We cut open one side to get the water out and after they love to play in it.