Oh, but that's so endearing. Since in this instance she's actually trying to be nice, she doesn't feel any particular qualms at his resemblance to Thor when he smiles--although the more she interacts with him, the more she notices it.

"Enjoy yourself. Shoo." She waves him away with a laugh. Later on, she might warn him never to tell a supernatural person 'I owe you for this', because they will take him up on it. "And best of luck."

She certainly intends to.