This is the 9740th most frequent Polish word.
zawaliła
"Zawaliła" means "she/it collapsed" or "she/it failed."
In this instance, 'zawalił się' (a reflexive form) illustrates the disruption or failure of an arrangement or plan.
Mój plan dnia zawalił się z powodu nieprzewidzianych okoliczności.
My daily schedule fell apart due to unforeseen circumstances.
In this context, 'zawaliła' describes failing or not succeeding in an important task.
Ona zawaliła ważny egzamin.
She failed an important exam.
Here, 'zawaliła' describes the physical collapse or falling apart of a structure.