After moving to Pashkevich Petersburg, in 1902, she graduated externally from the Gymnasium Alexandria for girls and joined a school for physical education teachers, Lieshafta AF

Pashkievich was one of the founders of the Belarusian Socialist Assembly. In 1904, she gave up teaching and returned to Vilnius. She organized workers' groups, wrote and promoted anti-government proclamations, and took part in debates and political meetings.

In 1908–1909 she lived in Krakow and studied at the Jagiellonian University's Faculty of humanities..

In 1911, she married Steponas Kairys, a Lithuanian engineer and social democracy activist. In the same year, she returned to Belarus and joined national educational activities.

During World War I, Alaiza Pashkievich worked as a Sister of Charity in a military hospital in Vilnius.

At the beginning of 1916, she traveled to her parents and helped villagers sick with typhoid. She also fell ill with typhus and died 5 February 1916.