Lanckorońska was active in the Polish resistance and was arrested, interrogated, tortured, tried and sentenced to death at Stanisławów prison.
In 1967 Lanckorońska established the Lanckoroński Foundation, which promotes and supports Polish culture, awarding over a million złotych per annum (US $330,000) for scholarships, publication of learned books, research into Polish archives in countries such as Lithuania, Belarus and Ukraine, and similar projects.