One of my colleagues has confided multiple things from her past in me. At first, I took this at face value, but she's told me the exact same thing on multiple occasions now, as if she's forgotten I already know. I have tried making suggestions to her of things that might help, but I don't think she's receptive to them. If I share my own stories in response there's very little reaction. I was struggling to put my finger on it, but having looked it up, it does sound like trauma dumping. I just feel like she tells me something major from her past quite often, leaving it playing on my mind (sometimes for days) and me trying to think of ways to help her, only for her to just change the subject. These things happen at strange times as well, and I don't feel like we're close enough friends for the level of disclosure she's making. Also, IME, friends share stories from the past and then you know them a little bit better, and next time you build the relationship with that knowledge in your mind. This is just repeating the same thing all the time.
Does this sound like trauma dumping? I don't want to be unsympathetic to her, but the way she so casually brings up really quite major things and then moves the conversation on just feels like it's an attempt to dump the associated hurt on me. I also find it incredibly frustrating to be told the same story (that happened 15 years ago!) repeatedly, by someone who ostensibly has zero interest in getting help for it!