In a rut in a nutshell

To make a really long story short, I just had a bad day with Cookie. It seems like we are not improving or moving on up as I would like us to do. We have our ups and downs but I want more ups and less, down on want to get bigger and better with her. She's 10 years old, trained, and has been there done that. But with me it doesn't seem that we can work on our problems together and solve them. We need to work on speed control, in an indoor, since she is not used to them and when I go in one she is a speed demon. I feel like she isn't responding to her loose-ring snaffle as well anymore. I did alot of walk/trot/halt/backing transitions and I know it wont come overnight but she knows this and i think i'm asking her the right questions but I don't know. I just need to get back into a lesson program with her so we can finally move forward.