@filmfann I wouldn’t jump onto that conclusion so quickly. Abused victims are likely to seek out people who share traits of their former abusers, most often unconsciously. The reasons vary, maybe they are so used to the abuse they think it’s a normal thing, maybe they are recreating and reliving their past as a response to unresolved trauma… But attention is never a reason.
Your hypothesis is the absolute worst case scenario and it puts a lot of blame on the victim, assuming she does suffer from something. I would look carefully into the history of your niece before coming to any conclusion.