Would you change a Yelp! review if someone asked you to?

I wrote an honest review on Yelp! about someone I did business with who could have potentially caused me to lose up to $80,000 due to bad advice (this is not an exaggeration and there is no chance that I might not have this correct). I think that I wrote the review in a professional manner, but if I saw the review, I wouldn’t do business with this person. Even though my Yelp! account doesn’t indicate my name, she was eventually able to figure out that it was probably me who wrote the review. Recently someone that knows both of us said that this woman wanted me to take down the review because it was hurting her business and she has no idea why I would write what I did. If we didn’t have a mutual acquaintance in common, I wouldn’t care about this at all, but we do. I feel embarrassed, but at the same time, I feel like other people should be warned. Also, if her other clients wrote good reviews about her (which only one has in the 2.5 years since I posted the review), then my review wouldn’t matter so much, right?

Here are my questions: Was it wrong to write the review without letting her know my complaints first? Should I remove the review?