I got this exercise wrong on the qwiz, but I don't see any explanation in the A2 Stress Pronouns lesson on why you would use "elle" rather than "lui." Isn't "lui" supposed to be for either gender?
1________ devez prendre une décision. You and she need to make a decision.
Toi et lui was marked as incorrect, and Toi et elle was marked as the correct answer, but I don't understand why.