She could barely talk through her tears. Marta Kaczyńska spoke at Karol Nawrocki's convention

The PiS-supported presidential candidate Karol Nawrocki is presenting his election program to the Poles today. His convention is attended by many crucial figures from the Law and Justice community, including Marta Kaczyńska, the daughter of the presidential couple who died in Smolensk. At the beginning of her speech, her voice broke due to 1 event. What precisely happened?