Messaging and managing perceptions is important for politicians (it's almost the entire job -- legislators should have aids that research and draft bills, and some of America's best presidents were known for delegating well, then practicing their golf swing for 4 years).

By not signing, if this bill ends up being a shit-show, then during her next campaign, she can say she didn't support it, but didn't want to block popular opinion.

If she does a last second veto, then her popularity will take a hit, but whoever forces the veto will continue to support her next election.

I have no idea which of the two paths will be taken, or what back room negotiations are at play. On the veto path, she might be tightening the proverbial thumb screws in exchange for campaign donations, or she might be executing according to the schedule of some high-paid corporate PR firm. It's even possible she thinks right-to-repair will be a shit-show for the state, and will veto it for that reason.

If she wants to continue to be governor, then it's crucial that we never know which of the above is true. See also: The dictator's handbook.