@RubyRubyRubyRubay
"How would Egypt stop the IDF opening the border from the Gazan side and forcing whoevers left in Palestine across? Would Egypt risk war with Israel over it?"
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To do this Israel would have to fully occupy Gaza up to the border with Egypt. They would then have to breach the border fencing etc with Egypt and then force the Palestinians across. All the while with Egypt using whatever means to stop this.
Egypt doesn't want a conflict with Israel and Israel doesn't want a conflict with Egypt over this. Remember both Israel and Egypt are allies of US.
What Egypt does want is a solution to this crisis asap, doesn't really care about Israel's views and to make sure that there are no further terrorist attacks from Gaza against Egypt in northern Sinai.