[YuriTokoro]

Originally Posted by Koir

That clears up my confusion. The way it was worded originally was like you were there with her, not hearing about it from your aunt after she came back.

Your revision is correct. It shows that you are telling what your aunt said to you about the assistant's words.

I’m sorry. I should have written I wasn’t with her.

Suggested revision:

"My aunt told me that the assistant liked her as she reminded her of her mother. The assistant wanted to exchange letters with my aunt, but my aunt didn't like how the assistant addressed her as 'Mama-san'. It made my aunt feel like a bar hostess."

The first sentence appears very difficult and confusing to understand, so here's how I analyze it.

"My aunt told me that the assistant liked her.."

The "her" refers to "my aunt" in this section.

"...as she reminded her of her mother."

"She" in this section again refers to "my aunt". It is the subject of the second complete sentence in the compound sentence (a sentence made up of two or more complete sentences sharing the same idea).

"Her" refers to the assistant herself. It cannot refer to "your aunt" as there is already another reference to her (the "she" earlier in the sentence).

Finally "her mother" refers to the assistant speaking about her mother.

I apologize for any confusion from my explanation. English is very technical when it comes to pronouns and what people or group of people they are referring to in a sentence.

So, “My aunt told me that the assistant liked her as she reminded her of her mother.” wouldn’t confuse native English speakers, right?
Japanese sentences don’t have that many pronouns. When I say the same thing in Japanese, I don’t say any pronouns such as “she” or “her”.
Writing/speaking English is difficult…

Thanks a lot, Koir!