Well, now is the point where you learn the difference between liking horses and knowing horses. They're not the same. You can read book after book after book on them, know them inside and out from an academic stand point, and then you can get on one and all that text book knowledge goes straight out the window
I know. Please don't think I'm trying to be rude - I'm not. I was in the horse market a few years ago too. There was one horse that I saw and wanted so bad. He was fiery, spunky, flashy, tall, young, and fast. I was 17 at the time I was looking for a horse and I had been riding since before I could walk, had been in lessons since I was 4. I fancied myself pretty experienced.
So my ego and I went to visit this horse. He was a four year old gelding. 16.1 hands and had a super flashy black and white coat. I was like, "Yup! I can ride him! No problem!" Swung myself up there and you know what? I soon realized that this was NOT the horse for me! He was nervous, VERY green, and VERY fast. Now, I like fast. It was an attribute I was looking for in a horse, in fact. But more important to speed was my comfort with him. I put him through his paces and it was very obvious to myself, my mother, and his owner, that I was NOT a good fit for him.
I test rode about 10 horses before I decided on my current boy. My current boy, Sonny, was 15 when I got him. He was a seasoned trail and barrel horse, had the speed I was looking for, was broke but not bombproof. He matches my skill level. His old owner is my mom's friend and she met us out on the trails with him and I test rode him there. We went through our paces while she explained to me how he reacts to certain things (the poor fellow is afraid of stumps and cows
To be honest, when I first rode him I thought he was boring. He just plods along and does his thing - where's the excitement? I tell you what, the excitement is when we're plodding along and suddenly a giant deadly stump appears and he jumps to the side. Or when I ask him to go and he goes 50 mph. IF YOU DON'T WANT TO READ ALL THAT
Yes, I believe your horse is too much horse for you. You did not test ride her in a conducive environment. You did not test ride multiple horses. You either need to get a trainer to help you out or get a more beginner friendly horse. A year does not make you not a beginner. If that were true then 2 year old me would be an expert!
Also, there is NOTHING wrong with bombproof horses or dead broke ones. Sonny could be considered dead broke as when he spooks he doesn't do much but jump sideways and he's a joy to ride and still manages to keep me, someone who's been riding for 20 years, on my toes. I feel you need to consider something other than the fun factor or the beauty factor when you go looking for your next horse. A test ride in a controlled environment like yours, I personally feel does nothing to determine what kind of horse you're dealing with.
Best of luck to you in your decision making.