Comment by jeroenhd

This isn't just about being a customer to a multinational bank: this also includes European banks who do business with American banks. For instance, most credit/debit cards in Europe are based on either Mastercard or Visa. All banks I know of will allow you to pay in dollars through online banking.

I don't think there are any European banks that don't communicate with American payment providers in some way by default. It's possible that there are some that trust their feature gates enough to take on these sanctioned people (like government-run banks for those who can't get a normal bank account, i.e. because of a history of fraud and crime), but I don't think these banks will advertise that ability.

Perhaps if she'd take an Iranian, North Korean, or Russian bank account, she might be able to do America-free banking, but that's not very practical outside of Iran, North Korea, or Russia at the moment.