I think 17 is too early for marriage, but at the time it is fairly normal in aristocratic and noble families. I do not mean that Marie Nicholievna was man crazy, but she wasn't intellectually inclined or ambitious in nature like her mother Alicky (who married rather late). But many in the family were flirtatious and longing to experiment with the opposite sex. Marie Kyrillovna & Ileana of Romania both belong to the later category and both had affairs even though they got married. Victoria Melita wasn't ready for that and without a guiding hand (Alicky at least have Dagmar), she created her own independent world. She did love Elisabeth, but her experience with a stern mother kept her from being more demonstrative, while Ernie whose experience with Alice was very different. Remember he gave her "the kiss of death". Marie Coburg would not have done that...she was much more practical than emotional.