Ehehe, yes she will - although she will protest at first and probably tell Yuuki she's dangerous, maybe just let her hang out in her forest hut and don't bother with her.
Listing good things about her magic is a bit tricky since, unlike how things happened in canon she hasn't had her diva moment or really practised her magic at this point, but: 1) apparently she could use it to fight if needed? She killed a forest monster at the start of the blizzard. 2) all the pretty, fun things she could do as a child - she imagines if she could just learn control she'd probably be able to do those things again. 3) she's not sure how much of what she could do during the Bridge event was Kiseki and how much was her, so she can't list that, so instead: that it used to make Anna happy.
As for herself... she'd say she's intelligent, has good taste, and is creative. It's not that she doesn't think she's a hard worker, dedicated or knowledgeable about her kingdom - she just thinks those are such basic, bare minimum traits of a ruler that they're not even worth mentioning.
What would Yuuki list as her worst qualities, and what would you list them as?