So it has been confirmed there never was cut content for her in Act III. They did an interview with IGN (and Samantha Béart retweeted it).
Which honestly makes it kind of sad that we have all these breadcrumbs. There are just so many obvious loose ends, its weird. It might just be that it was never fully fleshed out, due to the time crunch at the end, and she was a late addition, but who knows at this point.
