As I understand it, the ecumenical tag is for discussion of common ground. I don’t see how this applies here.
Without a discussion on what this means to a person we will get nowhere.
Especially in this article - at no point is she calling her former faith names, rather she writes about her joy in Christ and how she felt in the presence of God.
It is a wholly positive article about the joy in Christ -- and if that is not common ground, I'm not sure what is..