Thanks for your response. I do understand what you're saying. I'm just not sure exactly where she is right now. She'll 'happily' talk to me about her problems dealing with emotions. She's diagnosed BPD and is under a specialist BPD network where she currently has a CPN. She's supposed to be starting DBT soon and was told, yesterday, to buy the workbook in preparation. I don't know if the thought of the change is what 'scared' her into the overdose.
Despite seeming to be perfectly aware of what she's doing, she seems unable to stop. I'm hoping that, once she does the DBT, she'll have the skills to change. It's just very hard for all concerned at this stage.
Logically, I know there's very little I can do right now. However, it's really hard when I'd been talking to her all morning and then she leaves and almost immediately overdoses. It makes me feel like I must have got something wrong that meant her emotions were still too hard despite our conversation. I guess I want to make things better and feel like I failed.
When I feel I can't endure, I remind myself that my record for getting through bad days so far is 100%, and that's pretty good.