Hi again, and thanks for your additional information. She is quite young to be pregnant, but I'm glad you're watching her health and are in touch with the vet. I'm also glad you didn't have to subject her to the stress of a vet visit, and they were willing to prescribe the medication over the phone.
All the medications prescribed, are the appropriate ones for her diarrhea problem and the Forti-Flora is a 'probiotic', to add 'good' bacteria to her intestinal system.
While it's not uncommon for some pregnant cats to experience diarrhea right before they give birth, her symptoms may indicate that there's still either an intestinal parasite problem, an intestinal virus, or she may even be experiencing an allergy to some ingredients in her kitten chow. Her system may be more sensitive to the fillers like corn, corn gluten, wheat, soy, dairy products and artificial preservatives, which her food may contain, as these are common allergens for cats. Stress can cause diarrhea and blood in the stool, so this too, is a possibility. However, normally, a pregnant cat would not feel anxious over the pregnancy, as a human female might.
If she's eating and drinking well, that's good; I would recommend offering her some plain, skinless, boiled chicken breast (no seasonings, onion or garlic added) mixed with well-cooked white rice, and see if this bland and binding food helps her stool firm up. Make sure she's drinking sufficiently, as she's losing fluids through her loose stool.
Give the medications a chance to work, and hopefully between those, and the bland chicken and rice diet for a few days, you should begin to see a positive difference. Here is some more detailed information re: feline diarrhea, intestinal parasites and inflammatory bowel disease:
She should be ready to give birth in about a week, and this site will give you much needed and important information re: feline pregnancy and delivery:
I hope she'll be fine and please keep me posted on how she's doing and let me know when she has the babies. Thanks!