How can I help Cassima?

Hint 1 of 5:

The best thing you can do is to stop the vizier.

Hint 2 of 5:

Listen to what she has to say.

Hint 3 of 5:

Cassima needs to something to defend herself.

Hint 4 of 5:

Celeste could have used this item on the minotaur.

Hint 5 of 5:

Give Cassima the dagger.  It will be helpful later on.