I have an 8 year old mare that is basically a nice trail horse. We aren't fancy, we don't compete in anything, but we have a lot of fun learning new things. So, I would like to get her to start using herself more. I'd like to see her round up, lift the base of her neck, stretch her neck and back muscles and pivot her head around the bit. I am riding her in a Myler d-ring Comfort snaffle. What can I do/improve/change to get her engaged and carrying herself better? I realize her conformation may make it more difficult to get under herself. I also am not looking for high level collection. Any advice would be appreciated.