One of the weakest parts of this film was that it began (and ended) with a rather pointless visit to the future, introducing a young descendant of the family in the main plot, who is apparently investigating their family history. It is very unlikely on meeting elderly relatives (apparently only for the second time ever) that within a few minutes they would launch into an extremely complex story about an estranged relative. There are not too many teenagers who would be interested and confident enough to approach relatives they don't have a relationship with, about the 'family tree'. The film could stand alone without this subplot.
Also the implausibility of Anne reuniting with her adoptive family in old age and looking relatively pleased about seeing them, ruins the conclusion of the film. The plot did not need this complication. A far more effective ending would have been Anne disappearing in her nightdress (with the audience unsure whether she has lost her mind or whether she has escaped an adoptive family who are poisoning her).
Also the implausibility of Anne reuniting with her adoptive family in old age and looking relatively pleased about seeing them, ruins the conclusion of the film. The plot did not need this complication. A far more effective ending would have been Anne disappearing in her nightdress (with the audience unsure whether she has lost her mind or whether she has escaped an adoptive family who are poisoning her).