I wouldn't let her hatch any unless I had a fool proof plan for rehoming cockerels. You can easily get unlucky and get two boys from a two egg hatch.
I also don't give a new broody any eggs until she spends two successive nights sitting on fakes or the empty nest; I want to be sure she's committed. Yes, once they are sitting you can just let her do her thing; she'll give herself little breaks to poop, eat, and drink once or twice daily in most cases. If you NEVER see her come off, you can gently remove her once a day until she figures things out but this is usually pretty hands off. If it is super hot, mine take longer breaks for self care but it doesn't seem to impact their hatch rates.
Finally, if she's a low ranking hen she may get bullied off of a communal nest. I'd separate her if she's a lowbie in the flock and see if you can get her to sit elsewhere to protect the eggs and prevent egg "donations" from other hens that will not hatch on the correct timeline, or at all. You can leave her in a communal nest if you mark the intended eggs and remove new additions daily, but you still run the risk of incubated eggs being broken as dominant hens try to take their turn to lay. For hens I'm confident in, I let them raise chicks completely with the flock with no separation but it is always a risk. Nobody wants to see a chick injured or worse by a bully. Might be best to plan some kind of separate area unless you can supervise closely for the first few days.
Chick adoption is possible, but risky, and you may end up with injured (or worse) chicks that you have to raise yourself. Broodies don't always accept them. Definitely give her close to the full 21 days to sit and plan to get day-olds for best chance of success if you go this route. I've never done it myself so take this advice with a grain of salt.
Good luck!