« on: November 11, 2013, 10:50:55 PM »
The key to figuring out how everything was decided is that Alexei was unable to travel and would have to stay behind. In his parents' minds, he was still the most precious of all of their children and since Alexandra decided she must accompany her husband and not stay to care for her son, the choices regarding where the girls would end up fell to the four of them.
It was known that Alexei could misbehave and the two family members he would always mind were Olga and the Tsar. Therefore, Olga had to stay behind to care for her brother. Because their son was staying behind, there would need to be a household, and Tatiana was likely managing matters at the Governors House already so it made sense to leave her in place for the remainder of their stay.
This left the Younger Two. I think that Alexandra considered both girls to be "her legs", so clearly, at least one of the younger two had to accompany their often ill mother. Maria was loving and hard working. Anastasia at this time had taken over the bookkeeping of the household and was also "the morale officer". I think it was decided to have Anastasia stay behind because of her rapport with her brother and being able to keep his spirits up. That probably tipped the scale towards Maria going with her parents.
I am reasonably certain that none of the Emperor's children ever wanted to be separated from him, so in a sense, Voikov is correct.
All of this, by the way, is just my analysis. We really don't know what happened in making this decision.