So, I tried to go through and point out the most glaring errors, but if you want to fine-tune it, I'd recommend Grammarly, or I could help.♀️ It's an excellent story, just had one plot hole. Brad is the only one who had a chance to poison her without her knowing.
Both brad and Stacey both claimed to have drugged her but Brad is the only one who makes sense and could do it without being detected. How did Stacey get in the bathroom while she was in the tub and crush up the pills and put them into her wine without her noticing?
Anyways, it was just as good the second time around and I hope my massive bomb of comments helps you rise through the ranks a little so others can find it.
I think a prologue would be great, unless you're writing another book. I love Em's character.