Better get all such women & children out at once. They could probably manage to get Sarah & her kids to a US military base, then out of country, but that's be the last Saudi Americans to leave that way, I'll bet. SA would clamp down on ingress / egress to our Embassies & Consulates so much that another 'Sarah' would be 'purt near impossible.
Getting them to a military base would be tough, though, (do we have bases on that side of the desert?). Maybe they could smuggle them out across the Red Sea?