For what it's worth, AppMedia rated her the same for CQ as they did for farming (S).
Personally I think they underrated her farming, so I don't think she's quite as good at CQ as farming, but she should be quite good in theory. She can block NPs for the whole party, has a powerful and fast to use NP herself, provides good utility with party-wide charging and skill-seal. She's like Melusine who has traded her own critting for more utility.