By nobody responding, I was forced to work this out on my own. One day she said she was going to come lifting with me, then when I asked if she was coming, she said she was out of town at a restaurant. By the time she got to the gym, I had just finished lifting with my friends. She apologized, and I said "That's okay. But now I'm not inviting you to come anymore." My tone was not angry at all, but more matter-of-factly, as if you were saying to a kid "Now we're not going to McDonalds" when they are misbehaving. She immediately ran to catch up with me and gave me a huge laughing hug.
Since then, things have been slowly improving with who controls the frame. When it was finally bad one more time, I said "Haha jeez...you know it's funny, whenever you ask me things it seems like you're TELLING me what to do. Like 'We are going to lift tomorrow' and 'You should definitely call me.' From now on I'm not responding to anything without a please in it!

." Since the only other people around were my friends on my side, she had to take what I said as a lighthearted truth. Ever since, she says things like, "Are you going to the gym today? Cool, can I come?"
Thank you all for your silence! I learned something!
