As far as I know, she is considered one of, if not THE most, broken units available. Her skill just outright makes her deadly. And then her awakened skill is just.. like having an I WIN button.
For now, I'm currently using that account to make videos for getting 3 stars on as many maps as I can as a newbie account and only using lower level basic units obtained by finishing the maps available to everyone.
As it stands, my main account is still my main and I don't know that it will change. After thinking, it just seems silly to throw away all my efforts up until now and start over just because I got a lucky roll. Even if she is an amazing unit, I'll still be just fine without her. But she will most certainly help out the new account with upcoming event maps! I have tested her out a few times and even at level 5, deploying her and activating her skill right away has turned daunting situations into victorious miracles.