Honestly I think her drives are better off the way they are, they have massive invuln, but not instant enough to make them as bad as real DPs. Her drives actually give her a solid way to escape pressure without being broken, the only reason she isn't fun to play right now is because her drives are the ONLY thing good about her. If you try to approach a roosting opponent with a normal, its all good, unless they decide that they don't want to block, you will get hit out of all of her normals 90% of the time, so literally you have to go through the danger of approaching with drive, escaping pressure with drive, comboing with drive, etc. Approaching with drive is a terrible idea, no matter how much you have to do it.
I wouldn't mind if her drives were nerfed honestly, that's why 5D losing invuln doesn't bother me much, I would much rather be able to IB > 5A/5B to escape pressure.