I did some searches, and it does indeed appear she was involved in anti trafficking activities.
Seems like these senators that start looking into this do not end well:
https://abcnews.go.com/Politics/murder-suicide-considered-nancy-schaefers-death/story?id=10219809
Do you have anything more than that one link? All it says is that she recommended someone else to attend a conference on trafficking.
I can't find reference to her having an interest in any of the other articles I can find.
In fact, there's one source that says she was a guest recently on a QAnon themed radio show and only discussed sanctuary cities, not trafficking which you would think would resonate with that audience.