Here is another good link on breaking broody hens: http://www.the-chicken-chick.com/2012/05/broody-breaker-when-hens-mood-to-hatch.html
If a hen tends to go broody, they will do it in summertime. My chickens are mostly from hatcheries, and some that I have hatched from shipped eggs. At least...
She sounds like she is broody, wanting to hatch eggs. If you don't want that, you should isolate her in a large dog crate with food and water, but no badding. place a roost in it if possible. She needs to stay there for 3-5 days. If you do want her to sit on eggs, they should be collected and...