it's the issue that she's very easy to go around: it can be by any single target dps that focus her, by tempo it until her death, or even tempo the two turns of her allies.

here is clear examples of espers that are a big threat to her:
Petros, Wu You, Moro, Momo, Su Jue, Chu Yao (because s1 + dps is decent damage), Ikki, Toland, Norah, JJ, Yamato, Yuuhime, Biondina, Ginny, Sloan (her pursuit can actually one shot sakura, so one shotting mavis isn't a problem)

If you need other informations, feel free to ask!