How old is Frances?
There are lots of things that can cause chickens to limp. However, if your chicks that are 2 - 8 months old start limping, not wanting to walk, have a droopy wing, coughing or respiratory distress with no sinus congestion, etc. you should go over and read the Marek's thread and the article. https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
I don't want to send people into a panic, but the longer Marek's birds are sick and shedding virus all over the coop, the more birds you will have getting sick in the future. I wish you all luck.
There are lots of things that can cause chickens to limp. However, if your chicks that are 2 - 8 months old start limping, not wanting to walk, have a droopy wing, coughing or respiratory distress with no sinus congestion, etc. you should go over and read the Marek's thread and the article. https://www.backyardchickens.com/a/the-great-big-giant-mareks-disease-faq
I don't want to send people into a panic, but the longer Marek's birds are sick and shedding virus all over the coop, the more birds you will have getting sick in the future. I wish you all luck.