The Language of Flowers

I read about Vanessa Difffenbaugh's novel, The Language of Flowers, in Book Page. Actually, I saw it was about the problem of young adults aging out of the foster care system, read no further and put the book on hold. It's Diffenbaugh's first novel and the writing is absolutely beautiful. She also weaves the story well, but I had a hard time buying it. I almost put it down several times because it seemed too much of a stretch. I worked as a child welfare caseworker and it's hard for me to believe an infant could be brought into care and never get adopted. The character, Victoria, has nothing that would have prevented her finding a permanent home when she was young and it's extremely unlikely she'd have the same caseworker for 18 years. The stretches continued with the story, but it was hard for me to get past page 20 because of the basic premise of the book--I mean, if Victoria came into care when she was 10 or so, maybe even 8, I'd buy it, but as a baby?!?
I'm interested in the topic though and as I said, her writing is good so I pressed on. It's basically the story of how Victoria is able to overcome her tragic past and learn to love and accept love through working with flowers and their meanings. I can't really recommend this too highly, only because I'm a stickler for believability, but I would be interested in reading her next novel someday.