"I shrunk back so hard," the actress says of the moment of truth on set

There he was – Han Solo, Indiana Jones – just waiting to be kissed.

But Viola Davis, who had a major crush on Harrison Ford when she was younger, just couldn’t pull the trigger on her planned “ambush-kiss” on the set of Ender’s Game.

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“Listen, I didn’t want to say he was a crush of mine when I was a very young girl, because I did not want to be disrespectful of his age. But I wanted to ambush him,” Davis, 48, told PEOPLE at the film’s Los Angeles premiere Monday. “But it did not happen.”

Her plan to “plant a big one on him,” as she put it last week on The Ellen DeGeneres Show, fizzled at the moment of truth.

“I shrunk back, I shrunk back so hard, and so brutally, that we had to do another take!” the Tony Award winner said, laughing, of her costar, 71.

Davis also spoke of daughter Genesis, and what advice she would give other first-time moms.

“Forgive yourself – every minute of the day, every day, that would be No. 1,” she says. “You always focus on your mistakes as a mom, and you just have to know that you’re doing the best you can with what you know.”