The fact that you're posting here tells me that you, yourself, are apprehensive. Other things you stated also incline that you're giving into the behavior (which will make it harder to correct).
My case below:
The only place I have taken her is in a large hacking field by my barn. She was very nervous and reared/bucked/bolted/spun/ and spooked. I don't take her very far any more- just to where she is comfortable and then we turn around. I don't think she likes seeing the whole field, but she isn't this bad when we go cross country.
Some of it sounds like typical barn sour behavior. If she hasn't gone far since August, I can see it happening that way -- my mare was the exact way when I first started working with her. The previous owner kept her at the barn for months after purchasing her, then expected her to ride right out... She didn't. She was tense, reared/whirled (reared up and spun around) so quickly boss, who was riding her, got whiplash. She was kept away from the herd and would panic if a horse came close to her.
If you feel her winding up (Creampuff usually starts to move stiff in her shoulders & tucks her chin a little before she acts up -- look for your horse's "cues"), time to turn on her brain. Ask her to work; side pass, figure 8s, pace changes, etc. Something to get her focused on you
, because apparently she's not very attentive to you right now from what you're telling us.
Maybe an experienced friend can ride her out a few times for you? Someone who isn't easily swayed by naughty behavior? For the most part, she needs more respect for you as well as more exposure.
From the excerpt I quoted, you have taught her that it's "okay" to only go "so far." Ask her to go farther next time, I bet she'll act like a brat because she feels she doesn't "have" to.