What can they do? They are the longest standing Arab security partner to the West and Israel. They gave Israel early warning about the attacks. They locked down the Palestine border at the request of Israel and are cooperating with the US and Israel on aid flowing into Palestine. They only control the Suez (north Red Sea) and the Houthis are across-the-sea from Somalia. Egypt couldn't defend against Houthi rockets if they wanted to.
Egypt has a vested interest in stabilizing the region and returning to the status quo. They are politically and economically aligned with the West and Israel and their best, and only, option is to remain a stable partner.
Egypt has a vested interest in stabilizing the region and returning to the status quo. They are politically and economically aligned with the West and Israel and their best, and only, option is to remain a stable partner.