[QUOTE=PintoPonies;8190424]
For a green horse would it be better to start with them flat on the ground then raise them? Or does it matter?[/QUOTE]
Flat on the ground, find the better distances for her now, then a few inches further out so she stretches her stride a little bit.
Trotting over poles will help a horse get some suspension on the trot, especially those that have lots of knee action up and down.
It all depends on how she is speeding up, if what is called running away at the trot, nervous, if so as above, trying to slow her with your seat may help, but you need to have a very steady seat for that, not a hesitant or inconsistent one.
Many trots improve on their own once the horse learns to carry itself better, to work correctly over their backs and then collect and extend a little bit.