Umm, they're not. Once you pass the USCIS, it needs to make it to the US embassy and those are not quick given the backlog of cases they're working on. Stay the course as it's cheaper and definitely a better option as green card and ability to work from the moment she steps into the country through POE.
And what's your consulate that you say people are flying through with fast processing? AKA - complete your profile on VJ.