With my temper in check and my bruised emotions put to one side, I went ahead and thanked my friend and accountability partner for the pie. Then, I asked her why she baked me a pie when she knew I was watching my intake. The conversation went something like this.
"I've seen you eat pie on your
diet, and I know you like it."

The emphasis was hers.
I explained that my lifestyle changes allow for occasional treats, and while I appreciate the gesture that I'd prefer that she not give me any more pies. She said that she wouldn't, but it was said in a very noncommittal way.
I've decided that I don't want her as a partner.

I don't think that she sees my way of doing things as worthwhile because they aren't restrictive enough.
I guess I'm on my own.