After having worked as a nursing auxiliary at Högdalen hospital in southern Stockholm, Lundby-Wedin studied to become assistant nurse, and started to work at Danderyd hospital north of Stockholm. There, she got her first trade union assignment, as union liaison officer for the Swedish Municipal Workers' Union.
After working as a nursing auxiliary at Högdalen Hospital in southern Stockholm, Lundby-Wedin pursued training to become an assistant nurse and began working at Danderyd Hospital north of Stockholm. At Danderyd, she was appointed as the union liaison officer for the Swedish Municipal Workers' Union.