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Couples usually form symbiotic relationships to get things done. Division of labor, etc. I don't see KA as being "empty," she had her own interests, dressed as she wanted to dress, had an interest in yoga that was separate from CS's interest, etc. It is natural to "take on" the interests of your partner and there is nothing wrong with that. It doesn't apply "emptiness" at all, it is very natural. If we look at it from another side, CS would appear to be the "blood-sucking parasite" who lived off KA's talents and skills in a number of areas such as her ability to help set up a business for them as a couple, etc. But I don't think it is useful to use vitriol to call them names, they were trying to get on with life and it ended in a tragedy for both of them, as well as the ultimate tragedy for an innocent victim.
I believe that KA will pay for what she did as the legal system determines, but she deserves a fair trial as do all defendants in America.