I don’t think that rabies would be my first consideration with this. This sounds much more like something has created a state of high anxiety in her. It’s not going to be possible to say what without knowing the details of her daily life and recent adventures. That might even be difficult for you. But something has happened to make her skittish. Cats are very observant creatures and your other cats have noticed her body language and have responded with some signs themselves.
Very often the types of things to cause this behaviour are alterations in the cat’s immediate surroundings. So this may mean altered cat activity outside, a new neighbourhood dog, etc.
Her passing the stool in the living room is a common manifestation of anxiety in cats, well recognised. We call it misplaced defecation.
It’s still worthwhile having her assessed by your vet because illness can cause anxiety in cats but I feel her problem is more psychological than physiological.
It may be worthwhile talking to your vet about anti-anxiety treatment if this should persist. You should also consider obtaining some Feliway. This product is available on the internet, at pet supplies and from your vet. It is a spray that contains cat pheromones. Cats produce these chemicals from specialised chin glands. You will see them rubbing their chin on household objects, effectively marking these as "safe zones". So you can use the Feliway to mark your home as such. This reduces the anxiety. The product is safe and odourless to humans. This is the first step you should take. http://www.feliway.uk.com/ So don’t get too worried at this stage.
I hope I’ve been of some assistance.
Kindest regards, Peter