Yours is obviously a more complicated case and yes I was referring to @EagerVisa
Seems less common now but when ESTA first came in a lot of people who were otherwise seemingly eligible applied for a B and were refused and subsequently obtained ESTA approval. Sometimes soon after sometimes after a wait.
My first thought is to get JAG involved. Obviously I know nothing about Germany and SOFA, does seem odd that to stay in Germany you need something approved that is for you to leave Germany.
ESTA is possible if you have been denied a visa.
A Writ of Mandamus for a B? That would be an easy resolution. And not in your favour.
I think your problem was misrepresentation and the need for a waiver. They take about 6 months plus or minus.
The obvious solution if you are clueless is to employ the services of an Immigration Lawyer.
With you unwilling to answer basic questions I am noit sure how anyone here can help, all we can do is guess.
It does sound like your sister is holding information from you for whatever reason.
Well nobody here has such power.
Her Parents sponsored her to immigrate, Consulate charged her with Misrepresentation, usually that would also produce the opportunity to file a waiver, I 601, was a waiver filed?
Reminds me of the Double Gazing industry. Nothing wrong with the product but attracted a lot of shysters
A lot of these companies made their money out of loan originating. Think Carvana
Why have you not added her to your insurance
What is the plan?
Are you sure a Swede who ha emigrated still gets nearly free care when visiting?
AP is something you can file for when you file to adjust