She's capable. I think her team wants her to be on the radio again because of that Iggy collab, so they'll definitely going to try to make the album chart & radio friendly. I'm expecting FF 2.0.
She needs to have a radio deal + GOOD music video released the same day + high profile feature. And it needs to be a GOOD song. If those things align it should easily debut Top 10.
It depends on the song. Although I enjoy WB, it has no melody or chorus really. Britney just needs a fresh Max Martin song, radio deal and killer MV and she'll be good.