I would try to finish the course of 7 days for the Tylosin. It's possible she's off her food a bit since the Tylosin is reportedly bitter tasting so that could be affecting her taste. Try to encourage her to eat her normal feed, wet or dry. Stir in a bit of plain quality yogurt into her feed or offer bits of egg to see if she will be more interested.
Chickens do often eat better when they are around each other, so if possible, bring in a buddy to eat next to her or let her join her friends for a while during the day, especially during eating times, just make sure she's getting her medicated water.
Explain a bit more about switching coops.
She improved when you brought her in or when you housed her where? BUT when you put her in this particular coop/housing, symptoms returned. What's the differences - number of birds, type of bedding different, ventilation, rooster(?), location - any mold/mildew or???? Interesting, could be something in the environment causing symptoms or she's stressed - was she picked at by the others or anything like that - just trying to figure out what may be contributing to symptoms.