I know she's a strong foreigner and can solo stuff but most often when there's a Zerker boss I'll just bring out my Jalter whose dps is more than enough to finish it.
I also think that if she can solo any quest then my team can also clear it. However if I put her in a team, I have to worry about her cards rng as well.
The only reason I'm considering about rolling her is because I have no Foreigner. Saving for summer event so this is only for tickets.