How Does the Second Sister Die?

When the Jedi attempted to board the Mantis, the Second Sister shot at the ship from her TIE/IN interceptor.

Does Trilla die?

- Trilla is dead. - There are likely still at least seven other sisters out there, since we've only met the Second and the Ninth. - There's still a bunch of Force-sensitive children out there in the galaxy, but no one knows where they are. - Darth Vader knows Cal and Cere are alive.

Did Cal Kestis kill the Ninth sister?

She expressed her desire to kill him quickly, believing him to be an unworthy opponent. The pair then engaged in a fierce duel, the Ninth Sister using just one blade. However, Kestis soon slashed the Ninth Sister in the left leg and arm, causing her to cry out in pain and ignite her second blade.