The student internship is place to learn, grow, and try new things. There is a time and place for everything. You have to teach vocabulary, and content, but you can do it while teaching a lab or demonstration. My cooperating teacher and I teach differently, but she is willing to let me try anything I want. She has a good way of bringing me back down to earth when I want to do an experiment or demonstration that might need to be adjusted.
Communication is the key.
You shouldn't be afraid to ask your teacher if it is ok to do something. If you ask and give justification of why you want to teach that way, instead of telling her how you are going to teach they might be more willing to try your way.