I have tried to look for some similar situations online but cannot find any...a situation where someone was denied a tourist visa from a NON visa waiver country but then received citizenship from a visa waiver program country and applied again for the tourist visa.
She does not have a lot of strong ties to Germany...she has a bank account, health insurance card, can get a letter showing she needs to go back to work.
She did have these things above when she only was Brazilian.
I am just hoping that the German situation could help with 214b because someone who can stay in Europe indefinitely is less likely in my opinion to want to stay in the USA illegally than someone who can go back to Europe and work and live anywhere there.