There are certainly Catholics out there that make quite a bit of money, just as there are rich Protestants and rich Atheists.
Just because she has a Corvette doesn't mean that she isn't giving to the poor. You don't have to be dirt poor and drive a piece of crap car just so you can give to the poor and not look like a hypocrite.
I have a 1995 Acura Integra that I hang a Rosary from the rear view mirror. My mother has a 2008 Lexus that she hangs a Rosary from the rear view mirror.
Do I donate to the poor? Yes, not as much as I would like to be able to, but yes.
Does my mother? Yes.
Do I volunteer at my church? Yes.
Does my mother? Yes.
I live in a little apartment and my mother lives in a three bedroom Dome House, but that doesn't mean that she isn't caring for the poor or for God's people.
My mother helps more than I do because she has more money than I do, but she still has a nice house and a nice car.