Hello! My son did the exact same thing at the exact same time. He weaned himself gradually over the course of a week or so when he was just two weeks shy of his first birthday. I had also been planning to nurse him as long as he wanted to and was shocked and a little disappointed when he suddenly stopped and I ended up weaning myself with the pump! I had also not had much luck with the pump, but at least it was something to ease the pain once he refused to nurse entirely.
I made the mistake of thinking that he needed formula instead of milk and began a very expensive few months of suddenly having a formula-fed child. I found out later at his one-year check that I could have just started whole milk, so I'll pass that info along to you!
The good news is, he is now 2.5 and still eats a huge variety of foods. He really never looked back and now I have a 7-month-old daughter and I'm almost hoping she'll do the same thing! It saved me the torment of "weaning" and feeling like I was taking something so special away from him. My feeling is that this is totally normal and okay and if she is done, you should just rejoice in the fact that you breastfed for so long! What a wonderful start to life you gave her for almost her entire first year!