Also being a Senator makes her a better VP candidate.
Sooooooo not true. Just because you're a Senator doesn't make you a good VP candidate. For example, literally look at Tim Kaine.
Anyways, I'd say this governorship is prime for a GOP gain due to Trump's performance in the state.
Democrats literally always choose Senators as their VPs.
Holy hell you're right! Last non-senator was Geraldine Ferraro in 1984. Before that it was Shriver in 1972 (replacing a senator!) But Fritz Mondale was a senator, Humphrey was a senator, Muskie was a senator, LBJ was a senator, Kefauver was a senator, Sparkman was a senator...