Carissa doesn't have a dagger on her. She's not thinking that clearly, but she runs through the palace looking for things she can use to kill herself.
She starts by trying to drown herself in a fountain.
It doesn't seem to work; a Security hauls her out.
After some argument, she Hold Persons him and then drowns him. He doesn't have much in weapons, just a ceremonial barbed dagger that looks pretty hard to kill yourself with.
Carissa successfully bluffs a security team that follows on after his death.
The alarm has gone up in the Palace. More competent people are teleporting in. They're crying to take Carissa Sevar alive.
Carissa tries to kill herself with the barbed dagger.