OH no Lisa are they both ill now ?, I am so sorry to hear that.
Re Litter Trays, sounds like you need one upstairs with Rosie (very odd as I have a Rosie who lives upstairs !) and one downstairs for the baby, as far as food is concerned, I would feed them away from each other at the moment, after a while you should be able to feed them in the same room or even from the same bowl when they are eating the same food. I hope they are both ok xxx