Bearing in mind the meat of your QL is currently very short (excluding the biog, around 100 words) I think you have plenty of space to flest things out a little. Introducing a good Hook (facing death is possibly a good place to start) you can use this space to give us more information about your MC, her emotions and build a little more about the dilemma she is facing.
I would be slightly put off by the language you use here. Everything seems a little passive - see info below:
When Rosemary Bell isolates herself in an old Victorian home in Pleasant Bay, she hopes to find peace after the death of her husband. Instead, closing doors, scent of seaweed, and dreams of a drowning man haunt her.
By removing the "When" you bring things into the present - Rosemary Bell isolates herself in an old Victorian home... hoping to find peace... would be more active. The last sentence could be confusing - is Rosemary closing the doors, or is that the ghost?!? I don't think you can afford this possible confusion here.
The ghost of Jonathan Fraser begs her to help him, because she is gifted with the Sight and is the only one who can see him. Rosemary seeks answers from the townsfolk who seem to know more than they will tell say. One man will stop at nothing to keep secrets hidden, even murder. Rosemary must find the truth to help the ghost before she suffers his fate.
POV has shifted here to the ghost - I would suggest you keep it ALL with Rosemary as the subject, and sharpen the language. Rosemary questions the townsfolk etc. Then there is another POV shift to the antagonist, before shifting back to Rosemary.
I also think there is not enough made of her dilemma, and too little character for your MC to pull this off at the moment.
Within Dark Waters is a paranormal Wiccan novel, complete at 60,000 words. As a clairvoyant, I have a blog about developing psychic skills at http://lady-spiderwitch.blogspot.com. I have been published in Circle magazine: Celebrating Nature, Spirit and Magic, Essential Herbal magazine, Eternal Haunted Summer Ezine: pagan songs and tales, and Crone Newsletter Ezine.
I would suggest avoiding mention of blogs or non-print publication - well done for getting these credits, but Ezines are not the same thing!
I appreciate your time and interest in considering my query
and look forward to your response.
Rosemary keeps the portrait of her late husband, is a professional artist, and has isolated herself out of grief
Hope that answers some of the questions
Not sure whether that last bit is info for us, or whether you actually have this as the last part of your QL - I'm guessing the former!
Hope this is useful,