People are of course screened before leaving outbreak countries.
From what I heard, the woman was not symptomatic during travel, but woke up with possible symptoms the following day (yesterday). Ebola is not infectious until symptomatic, and is characterised by rapid onset to debilitating level (one of the reasons why it doesn't spread well, as the infectious patient really isn't up to going anywhere). So if there is risk to anyone, it'll be those (if anyone) with her overnight as highest risk.
She recognised the potential of the symptoms, and called them in straight away and has been in isolation since.
For those who want quarantine, where, who and for how long? All travellers from outbreak countries? Three weeks in individual isolation before exit? How is that going to be paid for in a country where there is no money and the international community is still short of the contributions required to handle the outbreak itself?