Was Shinigami originally a member of the foot?

[FredWolfLeonardo]

This question popped into my mind when I remembered that Karai and Shinigami are both members of the Foot Clan who were childhood friends.

Was Shinigami also a member of the foot clan from the start due to her lineage or just an outsider who happened to be good friends with Karai?

If she was good friends with Karai from the start, then was she originally a criminal in Japan who hated Hamato Yoshi just as Karai did?

I find this fascinating partially because Shinigami is very loyal to Karai in her mission to restore the honour of the foot but doesn't often voice her own opinion.

I wonder what Shinigami would've been like during seasons 1-2 when Karai was an enemy of the turtles, and what led her to side with Karai after she joined the turtles rather than joining the Shredder like most other Foot Clan members.