Need a little help

I started cross training for roller derby two months ago.

I'm 5'2 and about 138lbs. I've been going to the gym 3 times a week for an hour/hour and a half each time doing strength training. Running six miles a week. Plus regular derby practice 2 hours 2 times a week, with a game every other weekend.

Other than endurance improvements, I have not had any noticeable improvements. I cut my calorie intake a month before starting cross training. I've been taking protein shakes after workouts. I've been taking a pre-workout before games and practices.

Am I doing something wrong? Should I be doing something differently? Should I be noticing changes this soon?

Background info: I never worked out outside of derby practices.