"I was getting your weekly fee added up for next week and was wondering if you were planning on being late in the future? I will add it to your weekly fee next week for yesterday but wanted to remind you that you need to get ahold of me and ask/let me know you will be late. I'm sure you can understand the need for the communication to be sure I do not have to leave right at closing time." Etc.

Informs her, relates/appeals to common sense and communicates that she will have an added fee for yesterday.

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