Ailey won`t die by tomorrow from worms...so try not to panic.
I know it gives you the creeps....but it is going to be OK.....and it`s VERY UNLIKELY that you will get them . Just wash your hands good after sifting the literbox.
Iceolate her if she gets diahreah to a place where it can be easily cleaned up. (Some cats get it when they have worms)
The vet will tell you if all the cats need to be treated....I`d rather imagine so...and I say that because we had a kid that had them once and the whole family had to take the meds....but it may be different with cats and depending on the kind of worms they are.
Just be sure you get a good stool sample before going to the vet. (You can collect it up to 24 hours ahead of time, just keep it in the :censor::censor::censor::censor:....the fresher the better tho, so if you make a collection, and she goes again later, just toss the first baggie of " goodies" out and keep the newer one.) You can put the baggie inside a little paper bag or box so you don`t have to look at it in the :censor::censor::censor::censor:. :-)
Whatever you do, don`t try to buy over the counter worm meds. They won`t be very effective, and you probably don`t know what kind of worms you`d be treating, and that stuff can make your kitty sick. Get only from your vet. Luckily worm meds are one thing that is not very expensive...even if you have to do Salem and Isis too. Everything is going to work out in the end. (No pun intended)
Just try to stay calm and not freak out too much before you can get the poop to the vet and get meds.