When she asks for advice.....and you KNOW....that you have absolutely NOTHING different to say than what you previously advised.....then tell her that. Just calmly tell her that "I've given the same advice each and every time you ask me what to do. We're reliving the same situation all the time. So, something has to change. Either you act on the advice or see if you can get a different opinion from another person."
^OR...everytime she asks you what to do, tell her you don't know. She'll eventually stop bugging you when she sees that you're not going to spend energy on responding to her. Be friendly with her in all other ways...but feign the cluelessness. She'll find another friend to advise her.