Would Flora have suffered a similar fate?
First off, i assume that Miss Giddens sent the girl Flora away in order to prevent a potentially incestuous relationship from developing between Flora and Miles. If so, this may have also saved Flora's life. For Quint is said to have died after slipping and falling, and Miles apparently died the same way. Then after Quint's death, Miss Jessel grew despondent and drowned herself. Therefore, what if Flora hadn't left? Would she have rowed out into the lake and fallen into the waters? It seems reasonable to assume that she would have. For if a possessed Miles died in a similar way to Quint, it follows then that a possessed Flora would have died in a similar way to Miss Jessel.
To draw it out further. Miles' death was in my opinion foreshadowed by the housekeeper (Mrs. Grose) warning Miss Giddens about the danger of awakening a child from a bad dream, saying that it would be a shock. Similarly, the scene where Flora rowed a boat in the same lake where Jessel drowned may have been another foreshadowing. Or rather, a foreshadowing of what would have happened if she had remained on the estate and under the influence of Jessel.
Interestingly, when confronted by Miss Giddens, Flora claimed that Miles had taught her to row. Yet Miles was depicted in a previous scene as not at all interested in teaching her. The likelier scenario is that Flora was possessed by Jessel, who then compelled her to row the boat and dance that strange puppet-like dance. Afterward, Flora said that it felt like someone was watching her dance. Was it Jessel she felt was watching? Miss Giddens? Or was it in fact Quint? And was it a Jessel-possessed Flora who was dancing for him?
As though reenacting a pleasant moment from the often stormy Quint and Jessel relationship.
Speaking of which...earlier, following Miles' poetry recital scene, Miss Giddens said that The Horrors (the ghosts) were playing a game and using the children for their own purposes, presumably to reenact their life together. Yet it became more than that, since their relationship was doomed not only in life but in death as well. Therefore it became also a reenactment of their deaths. Or at least likely would have been "their deaths" if not for Flora exiting stage left and staying safely out of danger (or so we hope). Possibly the filmmakers decided, or knew instinctively, that killing off both the boy and the girl would have been too depressing, not to mention taking away the ambiguity of whether it were a ghost story or a governess going mad story. Thus they only hinted at what otherwise would have been.
A final note. This is an unusual movie for me in that it has become much more disturbing the second time through, now that i see it more as a ghost story than a psychological one.
I really didn't think i could come up with a good signature, but happily i thought of this one.