She was never really secretive about herself in the vampire community and given her age even then she'd had been a little hard to ignore when she was around (though she was less prolific by then, she had far from stopped - it just wasn't her peak). Given Lazarus was such a nasty asshole and she has a thing for playing games and then rather ruthlessly killing nasty assholes she probably would have been quite pleased to hear about his death. Its entirely possible Tobias would call her Ester, rather than Holland. <3