If she was worried why would she go back to America where she would get arrested? Just stay in France or whatever country she was working for (if her and Jeffery were really working for foreign intelligence)
My guess is she made a deal with FBI to turn herself in and rat on some people to get charges dropped but I wouldn’t put it past the Deep State to have her claim Trump went to the island and when Biden wins she gets a full pardon.
It makes sense she would make a deal to turn herself in.