is it right to turn back if you feel like you don't want to get married?

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i have a friend who is ina relationship with her boyfriend for some seven years now. they are actually planning for their wedding that will happen next year. She's 29 and the guy is 32. at first, they were really decided to get married but now is different. My friend feels like she doesn't want to do it anymore. She no longer feels the magic. She feels like she wants to do something more and she can do it better as a single. what keeps from not declining is the possibility that she might not have another good relationship. there's a possibility that her boyfriend will look for someone else. Afraid of being single for the rest of her life, she's kinda willing to accept her supposed fate next year. Which is right? To continue her soon-to-be wedding with the man whom she already no longer love that much or to drop the wedding and continue her dreams which can be achieved more if she's single? what are your views?