2010 was a lifetime ago with regards to political polarization. Partisan identit has become far more important and split ticket voting has collapsed.
How are ticket splitting trends related to GOP primaries?
There's no GOP primary, it's gonna be a blanket primary followed by a top-4 RCV. It's critical for her to come at least third in terms of First Preferences. If a strong Democrat and Trumpist canidate runs, she can be squesshed into being eliminated first and loosing.
The decline of split-ticket voting hints that voters might not be as favourable toward her type of canidates as they were in 2010.