Inasmuch as Ashley's move to California would involve her going to school for a beauty license, I don't think her chances of survival are all that slim. Kids can surprise you that way. I know mine did!
Getting accepted to a school, finding housing (something schools help you do), and finding a part time job once she settles in doesn't seem horribly challenging. If she were 28, jobless, and still living at home I would agree with you. But when your 20 year old has a plan to get the necessary training to make a living, I think you should not underestimate her ability to do that.
My kids went thousands of miles away from home for college. No mother ever fretted more than I did over this. Neither of them stayed in a dorm after their first semesters. They worked part time and had a lot of roommates. And they did live in very expensive cities (San Francisco and NYC).
I think this is defintely a reasonable goal for her. She's not enrolling in a premed program. Ashley has stated that she will find a job, as well as pursue a license, and will cover her own housing from the money she's made on Bravo. In my opinion, she deserves the support of her parents in this. All kids do. Jacqueline blogs that she believes in her daughter. She should demonstrate that, IMO. You know... support her plan instead of publicly ridiculing her on TV.
Win or lose, Ashley will be a better person for this experience.