This actually makes sense, Aquaris shouldn't be able to be in the Human realm (or w/e it's called) so she only came back to take them both back to the Celestial World or some other type of cesetial dimension where she will have then know what happened between their mothers and probably have a few other things to do. Then they come back and Brandish is team Fairy Tail, after a good comeback, she gets owned by several Spriggan or Zeref himself. Or atleast this is my theory based only on this panel, probably not accurate.