It's ironic. She might be the toughest member in TF, but that clearly wasn't enough for her to blow her cover over. See, after the end of TF's plan with the weapon, what is Malva doing? Reclining on her throne...powerful image when you consider what Lysandre was after.
My 100 RPG Battle Themes Countdown - give it a listen! https://www.youtube.com/playlist?list=PLrjNY3iWNtWyJvcNzXJL5WzxdtQ58N_hs