I have read of her later life and, while she certainly was happier than when she was under her mother's thumb, she still strikes me as someone who felt her life had been blighted. She only had that last decade, much of it with ill health, to claim any kind of independence. I go over lots of magazines and newspapers of the day and I just don't see her out and about the way I do the Schleswig-Holsteins or even her elderly Uncle Arthur. I'm more than happy to hear evidence of a more satisfying social life than what appears.
I view her with pity more than anything else--she was really a victim of a) the times which seemed fine with sacrificing one daughter to be the mother's eventual companion and b) her mother's selfish, smothering behavior in not just keeping her at her beck & call but actively thwarted potential love matches. She could've met Toria halfway and pulled a Helena or Beatrice on her--reluctantly allowing her to marry as long as she either stayed in country or at home. Toria had a blooming period from roughly 1905-1910. While she was middle aged by then and thus unlikely to have children, a widower with children of his own, from the nobility wouldn't have been looked at askance.