@Pearl
I get the impression that the woman you spoke about had a history of domestic violence? This is accepted as PTSD if it was severe but it is not the same thing as cPTSD.
However I agree with the church who said no public testimony containing details and it was on her own head for leaving. This may or may not be suitable for a small group setting but anyway, she was not very wise in wanting to go 'public' like that, in person.
The big thing that is not understood, is the power of love especially in a group setting towards the victims. This is all that is required - just make them feel accepted and loved - not easy in this era of church life. People will say oh yes we love the people in our church without any concept of how love was shown in the early church.
If severely traumatized people did get the level of healing love from your church, believe me, word would get round and your congregation would swell very quickly.