I advised against it, for my own safety of course. She was also thinking Kyudo. I encourage cooking instead but then kitchen cutlery is also an issue.
she has a terrible temper and we have some real rough-and-tumbles and the idea of her with a sword does not inspire me.
it has even been the case on more than one occasion when I'm on the OG while she is toiling in the kitchen where after some dispute she turned around with her angry face and kitchen knife in hand shouting at me about some nonense!