Hi Rose,
I think you need to rework your pitch. Currently you're pretty much just saying, "please read my book about how I was terribly abused," which isn't necessarily a selling point. If your book can be used by other people as inspiration or a guide to overcoming childhood abuse to become happy, successful adults, your pitch needs to reflect that. I would suggest tying your book's pitch into something newsworthy or timely. For example, if there is a national foster parent's day coming up, or an anniversary of the Children's Welfare Act, or any event that you can piggyback off of to pitch your book to papers or other publications as an inspiring story of triumph over the odds, that will help you get the book noticed. Saying in your pitch letter, "I think you'll find this useful," and not explaining in a sentence or two WHY they would find it useful doesn't work.
I agree with the others that the subtitle is an obstacle, so I would suggest not mentioning the subhead in your pitch.
Good luck!