It is possible that you might be able to hold her accountable legally, but you aren't going to be very capable of doing that if your PTSD is still out of control. Court is extremely stressful even for healthy people, stressful enough to make them give up or be unsuccessful at proving their case. It's likely that if you start the legal process while you're still relying on self-harm to cope and your PTSD is out of control, that the pressures of a legal battle will be too much for you to handle. If you become stable before you try to sue her or convict her, I think it would be more likely that things will go well for you and you might be able to send her to prison. It will be hard for you to help yourself get justice or help anyone else victimized by her get justice if you are mentally unstable.