Again, Franky had an entire family to go back to, and still chose the SHs. Just because Bonney has no crew doesn't make her SH material (especially with how bland her char's been). At most it means that by the end of the arc(s) she'll be a part of, she'll find a faction to join (like many have speculated, the Revs, following in her father's steps, maybe even forgiving Vegapunk AND escorting him to Dragon).