This is the 10713th most frequent Polish word.
dołączyła
"Dołączyła" means "she joined."
Here, 'dołączyła' indicates that Anna became a part of or joined the group.
Anna dołączyła do naszej grupy wczoraj.
Anna joined our group yesterday.
Here, 'dołączyła' is used in the context of contributing or participating in a specific effort, i.e., the project.
Nasza koleżanka, Maria, dołączyła do projektu w zeszłym tygodniu.
Our colleague, Maria, contributed to the project last week.
In this context, 'dołączyła' (plural 'dołączyło') denotes becoming part of an organization or community.