First off, Welcome to Pixies Mark!

Next, as far as the problem you are having with Amy, I think Ginger has it right on. You may not get a explanation that is satisfactory to you, but it sounds like she is just not into you. Maybe she was and she has changed her mind. In my personal experience if a woman is into you, she will do just about anything to make the time to see/speak/be with you.

I dated a woman many years ago that seemed sooooo into me and I was falling for her bad. We were hot and heavy for a month and she told me several times how she liked me so much, etc. Then, just like that, she is too busy to see me. Made no sense to me at all, but that's how it was. She ended up engaged to someone else about a month later.

For whatever reason, it turns out she wasn't into me. What that reason is does not matter. It won't change anything. Like Lou said, the best thing you can do is back off and see if she calls.

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Put me on wheels and I'll turn tricks.

Clever? Nah, I ran out of that years ago. But if you find this, let me know, k?
"The road goes ever on..." ~ Tolkien

In memory of my friend skip...
Go then, there are other worlds than these