Thanks for the replies. To answer the question on how she felt, she was very quiet and agreed with me. I think that she was very stung. I hate to do things like that, but I felt like it should be told. I've noticed lately that she seems to be having memory problems. But her habit of saying she will do something and not follow through has gone on for years.

It's a mystery as to why my friend thought that it wasn't good for me to have confronter her. I would say either it was because of hurting her feelings or that it wouldn't make a difference because she's not going to change.

Bear in mind that, as far as I can remember, only a couple of times I didn't come through for her when I said I would do something. Though I told her I was sorry that I change my mind for whatever reason and she got very nasty with me.
So that's like a double-standard. In fact, that's been very typical of my family, which is why I don't want to have much to do with them.