Culture clash

I have an assistant teacher in my classroom, since our school participates in this program that brings foreign students to the US for a semester or a year, to help teach their native languages (Spanish, French, German, etc.) in American classes. I suppose it's sort of like the Fulbright TA program, except the students who come over are in various situations: some have already graduated from college and want to spend some time abroad, some are studying to be teachers and want some real-world experience, and some are killing time before their student teaching starts. My intern belongs to the last group.

Now, I've tried to be open-minded and culturally aware, not to mention patient with the fact that she's not a teacher yet and things don't come naturally to her. However, it's been three months and I've come to a conclusion: We just don't get along. It's not that we really dislike each other, but we are just not on the same page at so many levels. For example, I still don't know very much about her life in Germany, other than her worries about getting a good student teaching placement. I also have no idea how much she knows about me. Other examples:

• I am at school 20 minutes before the kids arrive and usually until at least 5.00.
• She spends time chatting with the other interns downstairs and during lunch hour, showing up 15 minutes late in the morning and afternoon. She also does not help at dismissal, instead leaving early with one of the kids.
• I will send kids out of the group if they are acting up, and talk about it with them later.
• She reprimands them in front of the class, and pretty harshly at that (if you know Germans, you know what I mean).
• I recognize that when a large percentage of the kids aren't paying attention or doing what they're supposed to be doing, it's because I didn't give clear enough directions.
• She plows on ahead and continues to reprimand students for not listening.
• I tell anecdotes about some of the kids occasionally (come on, all teachers do), but in private, among coworkers.
• She talks to me about what some of the kids have done (usually negative stories) in class, within hearing of all of the other kids.
• Me (to kids): "Thank you for listening. Did you hear how quiet we were in the hallway? Everyone has earned a plus; you did a great job."
• She: "I heard that being here helped the last intern so much, and she's having a much easier time with her student teaching. I am so glad I'm doing this now; it'll make student teaching so much easier!"

Disclaimer: I am by no means super-teacher (hi, it's only my second year, I'm still figuring it all out). I think the main difference is that this is my job right now, and I am going to do it well if it kills me. My intern is just waiting around until her student teaching starts and earning a gold star for her resume.

Also, she's German and I'm not. That might have something to do with it.