Bottom line: Based on my own experience, I recommend not using her or at least exercising severe caution.
I knew I was not doing an all-inclusive so I figured I needed a wedding coordinator for sure. I had read some good reviews about Jennifer and certainly about her bakery Turtle Bay Cafe and she came recommended by one of my other wedding vendors. I exchanged a few different emails with her to get an idea of her style, prices and see if we were match. She was very responsive to those emails and said all the right things. I hired her in February, paid her 50% of the cost of the wedding in March ($2200), and from there on out it was nightmare city. She rarely responded to my emails and ended up sending me her signed contract six months later in August after I asked about a number of times, and she never finalized any of the vendors she was working on. By mid-December, I did not have a wedding location, a reception location, any kind of flower or decor suggestions, pictures, or photos, and the last e-mail Jennifer had responded to was in September (which is when I suggested that we just part ways as we obviously weren't working well together and she responded that she was terribly sorry she hadn't been more responsive, etc.). My wedding was 2 months away...
I don't think I'm a bridezilla -- I probably sent about 10-15 emails over the course of 10 months - and I wasn't looking for more than a reasonable reception/wedding location and some actual photo samples of flower arrangements, etc.
When I finally informed Jennifer that we just weren't going to work out and I needed to end the contract and asked for the return of the money I'd paid her for the vendors at the wedding ... no response. So not only did I not get any planning advice or help from her, but she kept half the cost of the actual wedding (not just 50% of her WC fee--which I still think would be unreasonable under the circumstances).
Again, I know some brides have had a great experience with Jennifer. But my experience is about as bad as I can imagine. I just can't account for her lack of enthusiasm, lack of responsiveness, and now keeping the money I need to have a wedding. Could be a fluke but I caution future brides.