Hi Brigitte,
Sorry it took me so long to answer, but I've been trying some things, to see if we can work things out with Juliet. The way I brought on the diarrhea was the sure tried method of switching her food, one meal and she was Ms. Super Pooper. Although I realize there's a chance she may have TF, having a negative test and a constipated sister cat (Isis), I now think that chance is pretty slim. To bring her back to normal, for the past 3 weeks I have them back on their regular diet: raw ground chicken with probiotic enzyme, and Authority (PetSmart brand) Hairball formula dry food. The Authority dry really constipates Isis though, so it's a juggling act. Juliet has gone back to normal, although she still drips from time to time. I have been also giving her GSE (grapefruit seed extract) which is said to have high antimicrobial properties, not sure if it's helping, as I have only given it to her 3 times or so, but her coat seems to be healthier.
We will be leaving on a vacation for 3 weeks, and my sister in law will be watching the cats, which will give them a lot of quiet time. I'm really getting to the point of starting to consider placing her with someone else though, as much as it pains me, but if she needs super quiet atmosphere to thrive, than I have to do whats best for her.