I agree with the comments about context. I'm reading a book about Queen Mary (George V's wife) at the moment and obviously there are lots of extracts from Victoria's letters in there, in most of which she doesn't come across as a controlling loon. Although she did do things like engineer the marriage between George and May (Mary), there are letters in which she acknowledges that she doesn't want to interfere in the internal matters of her family's marriages.
Plus you have to remember that the Royal Family was vvv different then. Victoria thought she was an executive monarch with real powers, unlike the present Queen, and she really believed that she was Queen because God had placed her on the throne. I think those things alone would make you think that you had a perfect right to control everything around you.
And the other European royals of the day also really believed that they were, I guess, ontologically different from everyone else. They were very snotty about princes and princesses who were descended from morganatic marriages, or who were merely Serene Highnesses instead of Royal Highnesses.
Plus the French Revolution would have been relatively not so long ago when Victoria was young - she probably thought she really had to keep a grip on her family or risk things going the same way.
Not that any of this would have made her any easier to have as a mother, of course. But I think it's about context, rather than about her having a particularly warped personality.