Conversation so far:
What is the Timbiriche Era?
In 1986, after the departure of Sasha Sokol from Timbiriche, Thalia became a member of the band.
Is Timbiriche Thalia's first band?
In 1981, when Thalia was nine years old, she was incorporated as a vocalist in a children's group named Pac Man.
How long was Thalia with Pac Man?
After Din-Din broke up in 1984, Thalia participated as a solo artist.
Did Pac Man have any success?
Thalia performed various times along with Din-Din in occasional events and parties, touring all over Mexico.
Who/what is Din-Din?
Pac Man changed their band name to "Din-Din".
Who else was in Din-Din?
CANNOTANSWER.
How long was Thalia with Timbiriche?
In 1989, Thalia departed from Timbiriche.

Question: Why did Thalia leave Timbiriche?
Self-contained rewrite: Why did Thalia leave Timbiriche?