Nah, if she's a dedicated broody she's just sitting quietly to get you to go away, then she'll immediately run back to her chosen nest.Hmmm...Clover has comfortably sat in the dirt of the shaded garden bed near the other chooks for about half an hour now...maybe her broodiness is broken?

Chicks raise themselves just fine on instinct, it's why chickens have been so successfully domesticated. Since you have adult chickens the chicks will learn to copy their behavior as long as you brood them near the flock.What I worry about though is if no one is broody now, and I have all these chicks, who will raise them? Teach them how to scratch in the dirt, keep them warm at night (even though it is very hot at the moment).
You will need a plan to provide heat at night, whether it's a brooder plate or a heat bulb or a heating pad w/o shut off.