Getting my daughter off of my sons title

[Matt Salinas]

When my son wanted to buy a house he didn't have good enough credit so my daughter had to put her name on the title as well because she had better credit.  Now several years later my son wants his house back and my daughter wants to buy her own house but can't because her credit is tied up in this house.  My son can't refinance because he is not working.  Is there a way to get my daughter off the title so she can be free of this house?  We are in Hillsboro, Oregon