Common situation for those who generally don't like APAs, IPAs, NEIPAs, ...
What styles of beer does she enjoy?
The words 'aftertaste' and 'bitterness' are pretty general. There's a "next" layer of hop flavors / aromas that may be helpful in identifying what she doesn't like about "hoppy" beer.
In my experience, some people get (and don't like) a lingering piney flavor from Cascade and related "c" hops (as well some high AA 'clean' bittering hops). Noble or noble-like hops (EKG, Willamette) seems to be less of a problem. Beer styles (darker beers) also seem to be less of a problem.
That may reduce the undesired flavor to a threshold where it can be no longer be tasted. But you have also made a different style of beer.