That's being rightly spun as Grimes avoiding the issue. And she can't avoid it. Not only does it generate bad "Grimes avoiding the issues" headlines, but she'll be closely associated with the law whether she likes it or not.
So if asked if she would've voted for it, why not say something like "Yes! And there are 421,000 Kentuckians who would thank me for that today. Of course, it's not perfect, so I'll vote to fix it where it's not great, unlike Mitch who won't allow any improvements."
That would highlight the law's benefits to the state, while also reinforcing McConnell's negative reputation as an endless obstructionist. Let Republicans throw their temper tantrums. No one is attracted to a candidate who responds with a defensive crouch. It is they who must defend stripping insurance away from over 400,000 Kentuckians. And given McConnell's early flailings on the issue, it's clear they recognize the danger ahead.