I was just about to say Jamags could answer that better than I could, because I’m not familiar with Dr. Doom (and am a bazillion years behind with current storylines/characterizations). That sounds kind of similar. From what little I’ve read of Shiva, her priority has always been validating her claim to being the world’s best fighter. Far as I know, that’s her main reason for acting as an assassin - to encounter challenges.
I think she had some history trying to find a protege, though, but I don’t know why she wanted one. Maybe @BatJamags can fill that part in? I believe she was kind to Dinah (Canary) in that time. I’m looking forward to reading Birds of Prey but am not there yet.