If you really like your current trainer, sit down and talk to him/her about your goals. Explain clearly and without pointing fingers or whining.
Write down your goals with your trainer, set a plan as to how you're going to get there. Perhaps there is another night for you to take lessons that has a more advanced class, or you're in this group for a reason. I don't say this to be mean, but she is the trainer, and in her eyes you're not ready to move up to the next block. But sitting down and talking may make these things clear.
If you can afford it, perhaps getting private lessons, or a semi private lesson may help you advance.
If your horse says no, you either asked the wrong question or asked the question wrong
And God took a handful of southerly wind, blew His breath over it and created the horse