There was some confusion, Mother let me know.
The sentence, on the one hand, has a comma splice, using a comma to connect two independent clauses. On the other hand, this is a case of an implied conjunction (as in: "There was some confusion, as Mother let me know").
Now, if the order of the clauses were flipped, it seems like it wouldn't need a comma.
Mother let me know there was some confusion. Is this because the conjunction (in that case: "then") would also be implied?
I try to help my students recognize independent clauses and realize when to use commas, conjunctions, and periods, but I realize that I'm now breaking those very same rules. I'd like some clarity.