Just thought I would give a quick update. I'm a really starting to feel more comfortable trotting. And I have seen some drastic changes in Bella as I get more comfortable with going a bit faster.
She no longer tosses her head at me under saddle (still does it in field) and most astounding to me is her spookiness has reduced to almost nothing.
I always though because I kept her head pointed where I wanted I was showing her leadership while riding. But now that I am focusing more on going into trots and back down to a walk, circles and going over trotting poles :) she is just so much more relaxed and responsive. I have hacked her off property 3 times since. Normally she would be nappy, shy and spook the whole ride. however now she may try it once or twice starting out, but then she will be no problem.
I had a muck around trotting her bareback last night, and this went well also. Only trotting small distances and not for long. I bounce around on her back a bit before I relax into it. I do not want to hurt her back so only practiced for about 10 minutes :)