As you mentioned, it can indeed be difficult to build up enough Furies on the higher level fights, where there's smaller room for error.
From personal experience, I'd go the same way as I did with my Crossbones, in that I invested a few points into Extended and Enhanced Fury. That way, even with everything going on, I'd have a little bit more breathing room available to try to catch the next Fury stack. While not a tremendous amount, it should help a bit in terms of providing a buffer.
In addition, her signature ability will also increase the duration of Fury, so while trying to snag 5 of them in one go would be the fastest route to getting a decent stack, it might be beneficial to play a bit more reserved and use the extra time to parry and charge repeatedly, and make use of SP1, as this also has a chance to trigger a few stacks for you.
One last note is that her SP3 also has a 90% chance of granting a permanent Fury, which could help some of the way in reducing the total number of stacks you need to build.
Why not giving her option of converting some of those furies to be permanent that way her damage can increase. I have used her and she is not as bad as many people say.
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Yeah i saw negative comments mostly