Meditrina

I am new to being an assistant manager and I am not really sure how to handle this situation at work, or even if there is a situation to have to handle.

There are 5 people in my area, me and a manager. Before I became assistant manager, they all reported directly to the manager. They still kinda do, but I am able to delegate work to 2 of them. One of them gives me a bit of an attitude about it and I am not sure why. She acts like some of the assignments are beneath her. She also does not ask for help until it is too late, after she already sent the file. She has not been here that long, I don't expect her to understand everything yet. I thought I made it clear that I have an open door policy and to ask me anything, even when I am on vacation I am available to help. Maybe she is upset because I am younger than her? I don't know. I found out that while I was on vacation last week, this person went into my office on several occasions. I did not find that she left anything for me to look at when I returned, I can't see that anything was taken out of it either. There is nothing on my desk or my wall that she would really need. I am left wondering why she was in here at all and not sure if I should approach her or not (you all know how much I hate confrontation). She has a window in her office, so there is no need to look out of mine. It makes me feel very uncomfortable wondering why she was in my office.

Is this something I should let go? ask her about it? Wait to see if it happens again?

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"Toughness is in the soul and spirit, not in muscles." ~Alex Karras