That last part is really neat. I have never seen that happen. My temperatures never get that hot. And by never, I mean NEVER. Thank God! Your poor girls!xs2
And when she kicks out the egg or stops sitting on it - or especially if she crushes it open - DO NOT PUT IT BACK UNDER HER OR UNDER A DIFFERENT BROODY - just my opinion of course, but I found out the hard way that a crushed egg becomes a rotten egg under a broody and then must be peeled off her feathers while she is still trying to hatch the other noncrushed eggs. And they stink something awful. Also putting it in the bator may sound like a good idea - but if you have other eggs in there hatching think twice as there was a reason that momma kicked it out.
Realize also that she may temporarily get off an egg or move it to the side when the weather is extremely hot - so don't assume she's abandoned it. You will know when she abandons the egg - she will move it completely away from her and not touch it again or she will distance herself as much as possible from it - sometimes she will even eat it. Observe any eggs that have been moved out and leave them alone or mark them so you know which ones they are and don't be tempted to push them back under the momma - she's regulating her hatch.
This past time the temps outside and in the coop were 103F-109F and Smokey & Topsy both would occassionally push their eggs out or stand over the eggs instead of squat down low - I was worried, but apparently that is just the way they regulate the temps. Trust the broody - I've had to learn to let go of my desire to "help" them and just trust their abilities until they give me a reason not to trust them.
When you mentioned the crushed egg, I thought it was really close to hatch. The crushed egg I left under my girl was due that day, and hatched no problem. I detected life though> it was peeping.