Broody Again! What to do?

You will need to keep her separate for the 21 days of incubation and then for 5 weeks after that till the chicks are fully feathered. Then you can look at introducing them to the rest of your flock.

So you will need another coop and run.

Thanks for your replies.  I have a separate small house and run that I originally bought for the three hens but decided wasn't big enough so I can isolate the broody in that.  I'll give it a good clean out and dust it with mite powder as a precaution.  I know this hen when she's broody won't shift off the nest on her own, so how long do I need to lift her off for each day and how long is it safe to leave the eggs uncovered?  I assume that the broody turns the eggs herself and maintains the temperature so I won't have to worry about temp, humidity etc like I've read about in incubator posts. 

How many eggs would you recommend I put under her?  There is a breeder half a mile up the road who supplies fertile eggs to Shrewsbury Market so I was going to pop up and see her.  OH willing to eat any cockerals produced  .  I don't really want to end up with more than another three laying hens due to space considerations, so would 6 be a good number to aim for, to allow for infertility / cockerals maybe come out with 2-3 to keep? 

Hens are wonderfull and do everything themselves apart from getting off the eggs  .
I kept lifting mine off twice a day like Sarah and found after a huge poo followed by mad dust bath, eating session and a drink they raced back to get on their eggs on their own. After about two weeks they got the message and got off them selfs but just once a day.
Agree 6 or 8 is a nice number to put under her.

Good luck and keep us informed, we love babies on here and want photos to go ooh and aarh over 

but with these you dont get the door slamming etc  plus they give you pressies around 5 or 6 times a week