I agree. I don't think Stevie is conservative, either socially or politically. Her father may have been conservative and she may agree with some of the fiscal aspects of that, but then again she said she had no idea what her money was invested in.
Also, I actually think Stevie and Lindsey are probably more alike now than they have ever been. They echo one another's views in interviews more often, use the same phrases and terms. Musically, I think they both have a healthy appreciation for all kinds of music. In their personal interpretations, I remember Lindsey saying that they really weren't that different in what they were conveying, just that Stevie would naturally lean more romantic.
It's hard to know what else they might share in common besides maybe an affinity for a good cup of coffee, reading, art, drawing, and vacations in Hawaii.
I know Stevie has a few things in common with Kristen though -- photography, songwriting, decorating, sequencing.