I like the fact that Cassie has this dark background with all these problems. It just makes her feel more real and relatable to me. Like if she was an actual person, I would be good friends with her. :)
Secondly, I saw no lack of periods whatsoever in this chapter. Your grammar was good and your commas were good as well. There were no major mistakes that I could see. The sense thing, yes, that's helpful, but dialogue is helpful too. I think this is very good and I really do love that Cassie is normal, you know? She seems to be pretty down to earth and chilled out and such and I'd love to read some more!
You have a lacking of periods and a bit too much comas, and you'd really be surprised to see that you can make your chapters longer if you elaborate more of what's around Cassie. Elaborate the five senses: what is she hearing? What is she smelling? What is she seeing? What is she touching, tasting? You can make everything muvh longer and detailed like that.
But aside from that it was very good. I'd like to see more of this story before making the co-write with you. Hope to see more soon :)