Just looked it up and Jessica Harper's character is small but a fairly significant one in the story. I didn't know she was the star of the original though. That means there's a double casting gimmick!
As for Quixote, it's not a disaster but don't expect a huge departure in scale and quality from the rest of latter day Gilliam. Whatever visual appeal is in it comes from the Spanish landscapes and buildings, there's almost no visual fantasy in it. The acting is good but the story is just really vague and all over the place. It's not easy to see what it was about it that had him obsessed with making it for so long.
Gilliam got blasted recently for slagging off the MeToo movement. With that in mind he should probably be thankful this film's barely getting a release because there's a lot of old fashioned gropy sexist stuff in it.