AFAIK, Ayn Rand’s problem isn’t so much that she is libertarian. She got it so right on the economic and capitalist idea.
She fell short because of her atheism and self-centeredness (is that a word?) in her philosophy.
I wish she would have acknowledged that we are creative and working beings because we are made in our Creator’s image. Somehow that denial of our uniqueness in the universe—that tenant of communism—stuck with her after she left the Bolsheviks in Russia.
The root difference between objectivism and libertarianism is non-altruism versus non-aggression. Libertarians have no problem with self-sacrifice as long as it's voluntary.