When I first saw The Lion King 2, I thought that Zira chose to kill herself instead of letting Kiara help her.

It was only later that I read that Disney didn't want to make it look like a suicide and removed what was going to be a smile on her face as she fell.
I am going to say that it's an unintentional 'win'. If you know what a suicide is, Zira clearly goes down that path. If you don't know what a suicide is, Zira simply lost her grip and fell.