I quoted in an earlier post, that in 1881, Dagmar wrote to her mother that her sister-in-law Marie "in my opinion...can no longer visit us here [because of Alexander's remarriage]; I consider it an impossibility, and she herself says so; how disconsolate she thus must be!" Whether they exchanged this view via correspondence, or whether Dagmar had seen Marie outside Russia, I don't know, but clearly the two of them must have discussed the situation in some form. It must have been very difficult for Alexander's children to maintain silence in such a situation, so fraught with potential disloyalty either to their sovereign or to their mother.