Lauren was committed to the little known sitcom M.Y.O.B., which NBC had ordered for the 1999-2000 season. NBC didn't have any use for it during the regular season though. M.Y.O.B aired every Tuesday in June, then was gone forever. 4 out of 8 episodes were unaired. Like the start of Gilmore Girls, Lauren was also mother to a 16 year old girl here. But the girl on M.Y.O.B. was a foster child. M.Y.O.B. not surprisingly stands for Mind Your Own Business.

https://www.tvline.com/2074292/why-lauren-graham-almost-left-gilmore-girls/