Did you take the money Don gave you? And if you didnt, maybe there is only a certain amount of days you have to save her.
I didn't... But I didn't get any option to save her from the characters I was supposed to either so... I don't know.
Did you find fawn at the condo? You need her to help cassie.
Yeah, but at which point? I don't have an option to ask yet and I don't want to continue doing it if I don't get any options for it.
If you have finished her quest, you can go ask her about the don. Come back the next day and she will give you a list of things to do inorder save cassie.