I doubt it. If she was inclined to go with an "establishment" pick to "balance" the ticket, I'd think of Daniels or Pawlenty over Romney -- especially if the 'rats stick with Biden. Barbour fits the bill here also, and adds more experience.
EV geography suggests maybe Allen from Virginia or Walker from Wisconsin.
Picking a foreign policy expert might be in the works. That can range from old hands like Bolton to newcomers like West.
Lots of options, and all better than Romney.
...interesting flip to 2008 McCain/Plain...