When I was younger, the local libraries seemed to only have Amelia's book though I have vague memories of maybe seeing the cover of this one. I never did get to read it until a friend sold me her copies of the books.
That said, if I'd read them in the proper order with Heather being first, I'd probably have liked Heather (the book and maybe the character?) more. As it is, she spends the whole book being upset that things aren't the way she imagined them to be instead of working with what she has, maybe getting things closer to what she'd hoped for. Which is probably fairly realistic but it's maddening to read at times.