While I agree with John and Denise I would add one thing:
In my opinion this is such a huge decision that you as parents need to have a formal meeting with your daughter (maybe a very nice dinner out) for the specific announced purpose of talking about the future. You two need to do your home work. Come prepared with all of the data that supports the importance of a college education. (Cheat, call your daughters adviser at the high school, they will be able to give you a package.)
Open the "meeting" with your stated support for your daughters decision no matter what that decision is, but that you do want to objectively discuss as adults, the strengths and weaknesses of various approaches to the future.
You should not raise the negatives of anything she wants to do. You should state the positives of a college education, and your willingness to help her get where ever she wants to go.
In my experience with students, often there are hidden agendas that the parents may not know about. i.e. she may not feel that you or she can afford college or there may be a special relationship that is influencing the desire to go to beauty school, or any of a hundred other reasons that are short term in their perspective.
In the end you should support her decision. Just make sure the decision making process has been one that focuses on the important long term issues not "urgent" short term ones. I would also espouse that you two understand that all plans need to be flexible and if she decides in a week or a month or a year to change her direction, that you will be there to assist in whatever the new direction happens to be.