2. I think it is a good idea to briefly point out the arguments for the other side, but I also think that whether you do that depends on whether you have time and space for it.
3. Say She loves fruit, but it upsets her stomach. Also, if there was a good reason to give examples of fruit putting those examples within parentheses would be a good way to do it.
I like your essay. How about taking the other side of the argument now?