Congrats on your mare. I have an appy too. He's 9 years old and green broke and I'm also a green rider. LOL maybe not a good combination. I bought him from my riding instructor/trainer. I adored him and she thought he would be a good learning experience for me. I still take lessons from her and she helps me with my ground schooling and training. We have come a long way from what we were when I 1st got him.
At 1st I said he was stubborn too, but it turns out that he was a lot smarter than I was. He had a lot more training than I knew what to do with. I'm still in lessons on him and on some of the other horses there. If your appy is like mine, If you get too relaxed while riding, she'll test ya and make sure you are paying attention to her.
Happy trails to you and your new horse.