I have an EE who has the broody like instinct. She will sit on a bunch of eggs and on occasion I hear her growling at other hens that try and get in the box with her and sometimes I open and theres two birds piled up. She will leave if I take the eggs out of nest and sometimes after so long leaves anyway but doesn't go back. I have a roo and would love her to raise some she is one of three gentle girls I have. What can I do to help her along? And how to keep her on them.
There is nothing you can do to make a hen go into a good brood if she isn't inclined gentically and hormonally to do so, but I have seen less dominant hens be forced out of a nest by more so often that they do not stick to a brood.
What you can do to see if she has the mettle is to put her in her own isolated nest with a couple fake eggs the next time she shows tendency to brood.
No other hen (or roo) should be able to get into her area. It should be dim, lined with very cozy soft hay/bedding, and have a distinguishable "box" that is not more than an inch or two high, and out of any drafts so it looks and feels like a cozy, confined, dimly lit nest. She should have room to get up, turn around, and then take a step or two to food and water (which is placed on something stable so it can't tip over into the nest). Ideally she should be able to get to a run to stretch and dust bathe, but in the beginning I "lock" them in for a day or two without the ability to get to a run to see if I can settle the hen.
If she is not in the mood, all you get is a mad hen determined to get out of the isolation box...so watch closely and let her out if she becomes frantic....but if she gets up and paces but settles, let it ride to see if she'll settle down to a good brood. Once she has, you can open up an area for her to dust bathe which can even be a box of dirt set in for her use. If she stays faithful, then place your hatching eggs under her. It is vital though, with these less dominant hens that they are not disturbed by others.
Be aware that this trait can mean the hen doesn't have the genetic makeup for a really good brood and won't stick...but I've had several who were hesitant in the main coop settle down into a very nice brood in an isolation hutch and hatch some nice chicks for me....after I "nursed" the idea for them at first.
Good luck.
LofMc