It's ok to be mad and feel whatever you feel about your friend, the police, peers... I hear you that it's a struggle to feel safe and you feel as though an unspoken boundary of yours was violated by your friend. It strikes me that maybe some of this anger is part of a fight or flight response to the original trauma.
I have a very short list of friends I speak to when triggered and in a dark place, and a much longer list of friends and others I do not ever interact with when triggered. I will not answer their calls or spend time with them when in a rough place... because it's me taking care of me. I know they are not someone who can handle my trauma and symptoms in a way that is helpful to me. Sure, I get annoyed at times, but they don't need to be shamed and blamed for it, as they all have their own reasons why they can't just go there (lack of training, info, ability, their own trauma, etc.)
I have point blank expressed a plan to die while dissociative and then come out of it and totally didn't remember I said it even minutes later. I knew only because I recorded myself. When I came out of it, I was totally sure I wasn't suicidal. For whatever reason, your friend and the police were unconvinced by your actions that you were not safe enough to be alone and felt you needed someone there to make sure you'd stay alive. Fair and accurate? maybe not. But she did not intend harm to you, only good, even if she totally missed the ball. I've also been on the other side of a friend in great despair and not acting typical, and struggled with how to handle the situation (and I have a ton of training unlike most.) I've also had friends die who made passive suicidal and active statements that no one took seriously and didn't call for a welfare check... they called the police only they failed to show up for work, only to find their bodies...
I'd be more worried if your friend blew you off entirely. She did what she knew to do. Maybe she needs some more tools to be a better supporter.
I guess I might not feel as angry if I felt like she had made a stronger effort to actually be there for me as a friend, with compassion. For me, it felt like “Oh, I haven’t had time to be present for many weeks and I’m just going to slider her off to the police so they can help her because it’s too much for me.”
This might be a really good thing to talk to her about. It's ok to be angry you don't have the support you need, but be careful about who is the enemy. I have to remind myself of this. I get spooked by friends trying to help the best they know. Most people need to be taught how to help. Some are willing to learn, and those that are not, I can quickly move on from.
I have talked with my therapist about it. I will brainstorm some ideas with her guidance about how to develop a plan that I can share with loved ones that honors the relationship and all involved.
This is excellent! I hope it helps. I hope she turns out to be a friend who is willing to learn how to better support you through the hell that is PTSD.