Snarly

I have been riding for about 9 months and am at the low end of the sport level. I am an older rider and female, 43 to be exact. Anyway, I keep getting frustrated about my consistency in being able to perform certain moves. One day I can do everything really well. The next time I go out, I can't do any of the moves that weren't any problem in my previous practice to save my life. Then maybe the time after that I can do some things really well but not everything. Is this normal at this level and does anyone else have this problem?