Taxing rich people who multi domicile is certainly very tricky and I don’t know enough about it to say what the exact solution is. But fundamentally I don’t really care about her having to move to another place to find more favorable tax treatment. She could’ve stayed in Canada but she gambled on the UK and now she’ll gamble on Italy and likely have to gamble on somewhere else in the future. We all know the rich aren’t paying their fair share so fundamentally I don’t really care about her “plight”. Rich people moving jurisdictions to avoid taxes is not something I sympathize with because they fundamentally crowd out locals. Look at all the 6 month and 1 dayers in the US. It causes issues that I don’t think their wealth creation makes up for because it raises prices and crowds out others with fewer resources who might otherwise be able to start local first businesses.
It is about selecting policies that yield a great economy and that create an environment where large swaths of people aren’t able to live (reasonably) well.