Why does Mrs garrett leave the show

Cause she got a job at Eastland as a housemother and that's what started to show "facts of life"

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Blair: Hold it, you ruined my watch.
Jo: No I didn't, it's a stop watch...it stopped

Jo: So things change, you're born, ya move on, ya die, that's life.
Blair: Don't get too mushy on us!

MS. G HAD TO LEAVE DS BECAUSSE SHE GOT OFFERED THE JOB ACTING ON FOL AND COULDN`T BE IN 2 SHOWS SO SHE CHOSE TO BE IN FOL