As you said, Prince, Alix was a charming and beautiful woman. She had a winning touch with the common man but was still Royal to her fingertips.
She did seem unfortunately possessive with her children and did not really attempt to raise them to be independent of her. This at least in part would be due to her husband's well known neglect of her and her increasing deafness, both very isolating problems.
I think her treatment of Toria was thoughtless and selfish but not deliberate at all - knowing Alix's personality, she was probably airily unaware of her daughter's resentment and unhappiness and would, I'm sure, have made at least some effort to change things for her if she had some degree of awareness of this.
As far as I can see, this is the only grievous fault in Alix's otherwise kind, well balanced character and, to me, her virtues far and away outweigh her faults.