I wonder if she tried GLS Bank? They style themselves as a fair/alternative bank only investing in ethically good things. Lot's of people I know moved their bank account there. It would be interesting to hear if they reject to give bank accounts to people in need. Although perhaps there is something in German law that prevents banks from doing that?

https://www.gls.de/privatkunden/

There are a couple of other banks with a similar public agenda, but I don't recall their names.