To be fair, Rikka never stood a chance against a Time Traveler who's looped long enough that she could have FILE CABINENTS for EVERYONE OF HER TARGETS OF INTEREST! She was never going to win, because Yotsuba had her READ LIKE A FUCKING BOOK!
One advantage over Clover is they are unaware how many times Yotsuba has looped. Meaning they have has no idea if a plan of theres has already been done already and she knows or not, at the same time though, if their smart, then Rikka's action was a Thanatos Gambit where they predicted that Yotsuba already knew everything about Rikka already, but not on them as if she did, Yotsuba would have already directly "DEALT" with them already, meaning she doesn't know their identity. The best hope they have for DEFEATING a Time Traveler IS to sacrifice PAWNS to get that chance! Rikka was likely BAIT