where does your story start?

As I have referenced in past posts, I'm having a bit of difficulty with the present action in my thus far untitled wip.

Here is the meat of the story: Laurel is tweny-five-ish (don't worry, she'll have a definite age before her creator queries anyone) and her exboyfriend dies. She believes it was suicide and that she was, in large part or in some part, to blame, even though they broke up a couple of years before the accident. (Are you intrigued? I hope you are intrigued.)

(To prologue or not to prologue? I love my prologue. My mc gets the news: the boy died.)

Either way, when the story begins at chapter one, where should it start?

I have started it a few ways. I started it a couple of months before David, the aforementioned exboyfriend, died. I started it with Laurel having trouble sleeping. She spirals downward into a certain mental anguish, a manic depression... a preocupation with her past, her present, her, her, herself. I wrote this for a couple of hundred words. Then, I decided it might be better to start from the beginning.

Enter: Chapter One, Version Two. David and Laurel met, talked their first talk, blah, etc. It was summer and she was leaving for college. Would they or wouldn't they (continue to date)? This is really the bulk of what I've written in November. I'm good with these scenes, I like the way things play out, and I will definitely be using all this.

But, last night, it hit me. The way Laurel turned out and the decisions she made that led her to break David's heart (and her own spirit, really) -- these things were a result of her childhood. Her story starts there.

So, enter previously written short story, which begins:

Laurel remembers clearly the day her mother left her father. She was no older than five; she hadn't yet started kindergarten. Her sister, Laine, was a screaming toddler.

Yes, as I lay awake last night (thanking veterans everywhere that I don't have to work today) I realized that it just might be okay to start allthewaybackthere... that I just might be able to pull it off, to make it a little more novel-y, and so:

     It all started when Laurel's mother walked out on her father, because don't all our stories really start there, back in those formidable years? The deck might already be stacked against us, but the cards are still being shuffled and haven't been dealt yet. Then, like ligtning, some event or non-event happens or does not happen, and we are thrust into the wheels of fate, which are turned and clank.
    
     Laurel was five years old; she hadn't yet started kindergarten. Her sister, Laine, was a screaming toddler.

What do you think, readers? Would you read a book about a woman who is trying to cope with the death of someone she loved, but did not love particularly well... if the story started with her childhood?

Damn. I need a crit group. And a stiff drink.