Update on Blaze in My Heart

You might have heard in some of the interviews I've done that I rarely plan when I write. I mean, I do, but most of the time it's in my head, if you know what I mean. So when I was staring at the blank Word document in September, I was thinking, "I have no idea what I want to write about in this sequel." I had writer's block, but not for long.
I realized that every good author has to plan, and it doesn't matter if it's a quick outline of the book, or a deep, detailed, description of every character, every setting, EVERYTHING. When you plan, it's rare that you have writer's block, because well, you know what you're going to write about. The only problem that comes up to surface now is HOW you're going to write about that.
So that's what I did. I planned. And boy, did it work. I didn't plan the whole book out--that would take forever. But I am maybe four or five chapters ahead, and I'm glad that I am. So far, everything's going great with Blaze in My Heart, but there are a few things I want to change:
1. I'm really young, so I want to improve my writing style. Use better words, adjectives, you know the drill.
2. I want to deepen the relationships between the characters. I don't only want to emphasize WHAT, but also WHY. Why do I trust this person this much? Why do I care?
3. I want Evaline to be MUCH MUCH MUCH more realistic. I want her to be more aware of her surroundings, and not be very oblivious to obvious answers. I know that it's what a good author does, but whenever I read books like that, I feel like I'm watching Dora. The. Mountain. Is. Behind. You.
4. I'm not very sure about the title. I'm sure I want to include the word "heart" somewhere. But, Blaze in My Heart just doesn't do it for me. I'm thinking maybe Blazing Heart?
Also, something crossed my mind a few days ago. I'm about 15,000 words into Blaze in My Heart, but the readers of Pure at Heart, are missing a lot. They don't know a lot about Eva's background, how her pack started, what happened to her father. Pure at Heart just zooms straight into the conflict and there's barely any background information. Because of this, I was thinking I could write maybe one of those "0.5" novels. I could describe life for Eva and the Shadow clan when they just started, how they all met, blah blah blah. The title could be maybe, "Dark Heart"? I don't know, still thinking. A lot.