Final college decision is months away, and your D may still change her mind several times. This is normal and you will be the supportive parent you are as you listen to her.
Recognize that your D is coming off an emotional high from a new experience, and theater is all she can think of now. You don’t have to force her to pick a major or even a college. Just need to see if she wants to add any other college applications over winter break.
And love the ideas mentioned about job shadowing. Add some reality to her dreams.