You're welcome! See if you can find some Lemon Balm. It has the most amazing smell and I read the other day in a magazine that eating small amounts of it (2 fresh leaves on a salad for example) helps relieve stress. It has some other medicinal uses as well, but I can't remember it all now.
Welcome to BYC The infamous "bucket trap" works quite well:
https://www.backyardchickens.com/t/747201/5-gallon-bucket-mouse-trap
Also mint is a completely safe, natural mouse repellent. Plant some mint (spearmint, peppermint, wintergreen or Melissa (lemon balm)) around your coop and/or...