If she likes him back the same way, she'll say "Hooray! Guess what, I feel the same way about you! Let's date!"

If she doesn't like him back the same way, she'll think "Ew, awkward. I don't want to hurt his feelings and I'd still like to be friends with him, but I don't want to lead him on either." And she'll likely say something like she's not interested in dating right now, or she likes your friendship just the way it is.

If she didn't say much of anything, it's safe to assume she doesn't feel the same way but she hasn't figured out a way to let you down gently.