Clucky is limping

Have only had my chickens for a couple of months and this morning I noticed that clucky was limping.  I held her while my husband had a look at her foot but there doesn't seem to be anything wrong with it.  She is still laying and seems perfectly okay apart from her limp    Has anyone else had a chicken with a limp?  Need some advice

Thanks for the advice   Will try and catch her tonight and have a look.  She's pretty quick for a chicken with a bad leg!!!