If you leave the tie wires or string on them, they should stay pretty whole? Plus 2 side by side will not only make a good landing spot for her and babies but a launching point for her to get up too. She will take better care of herself if it's easy on her.
That would work! Don't worry about her too much though. She's an excellent flier. Like a really good flier. She sleeps in a tree twice as high every night
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You can leave her in there and see how it goes this time, but she's got a long life of broodiness, she should probably have a designated "Cruellas Broody Nest" only for all the babies she's going to raise. 

