Ayn Rand was not a philosopher and Objectivism is not some collection of philosophical arguments. Even by her own admission, she was opposed to philosophy as a field. Her work is predominantly a collection of her opinions and unsubstantiated postulates and proposals of what she considers ideal economic and social systems, which some people adhere to. In this sense, it seems more accurate to describe her as a politician and her work as an ideology, rather than having anything to do with philosophy.
Given that, why is she often quoted and cited on this forum? If she has nothing to do with philosophy and her arguments are not philosophical in nature, what is the point? Most of the times that she is cited, it is almost always in questions of the type "what is wrong with this philosopher's argument", and then some answerer will cite Ayn Rand's opinion of said philosopher's argument. It won't be a counterargument, just an opinion. For example, somebody will ask "what is wrong with Rawl's argument here", and instead of e.g. bringing up a contradiction or a false premise or whatever in Rawls argument, somebody will show up with an Ayn Rand quote that basically says "yeaaah, I don't like that conclusion by Rawls, my system is better". Ok, great, but that's not an argument.