Howdy
PearlTheDuck
I agree with everything
TheTwoRoos and
aart has posted but will give you my responses to your questions also as I was already typing them
How long will she be on the eggs?
20-21 days is the average hatch time.
Does the weather matter?
Hens can and have raised chicks in the middle of winter but with your Spring coming, I agree that it is probably worth waiting that bit longer.
How will she get food and water if she's always on the eggs?
Broody hens usually take a break at least once or twice a day to stretch their legs, get something to eat and drink and drop a rather nasty on the olfactory receptors, huge broody poop.
I have a broody hen who did not get this memo and I have to take her off the nest twice a day or she would sit there for days on end without a break
Once they hatch do I take them and care for them in a brooder with a lamp or let them stay outside with her? Or do I put her in the brooder with them?
I definitely opt for leaving the bubs with mumma. If she is a good mumma she will protect them, keep them warm and teach them everything they need to know. I will never tire of watching a mumma hen raise her babies; so, so adorable!
Some people leave the broody hen in with the flock and the chicks are raised in the flock also. Unfortunately, my flock dynamics do not allow this and I give my broody hens their own area to hatch and raise their little ones. However, you will then have to integrate her and any littles ones you keep back into the flock when the time comes.
If she's alone with the chicks, what about food? How can she get calcium when the chicks are eating starter food?
As mentioned, she will not lay eggs while she is brooding. She will be fine eating the starter food with the bubs.
How do I know the eggs are fertilized?
If you are wanting to know if your rooster is doing his job, crack open a couple of eggs and check for the bulls eye. Google has many images on the difference between fertile and non fertile eggs.
If you want to know if the eggs are developing under the hen, then I agree that candling is the way to go.
How do I encourage my hens to go broody?
Broodiness is hormone based so, technically, you can not make a hen go broody. Some breeds never go broody and others are renown for their broodiness.
Some people say that leaving eggs in the nest might encourage them to brood but you would still need to have a hen prone to going broody.
Broody hens was a Topic of the Week and you may find this thread helpful:
https://www.backyardchickens.com/t/1137969/topic-of-the-week-broody-hens
Best wishes!