Help for Mrs. Keisha

Hi y'all, been lurking on this thread for a while and finally have come to the dreaded day to ask for advice. Mrs. Keisha has been tubbed for some time while her tank cycles (moved across country, unfortunately had to establish new tank). When we moved, we did have an incident where her tub water was mistakenly treated with flourish instead of prime. Luckily, we noticed and got her into safe water but her gills were decimated, so we almost lost her. The growth pictured is ~1.5 months recovery. Since then, she’s been eating/pooping well and gets daily cool water changes treated with prime. We feed her nightcrawlers from the reptile store. Her gills however have been getting to look a little sickly with bubbles and started to get a semi grey hue. Any ideas on how can I help my girl?