[YuriTokoro]

Originally Posted by girigiri

思い過ごし、きっと。　けれども、使い過ぎれば、子供 っぽく思われることができます。

Thanks, girigiri-san.
You write in Japanese. Great!!!

Using direct quote style too much may sounds childish. I see.

交感です ...　or should that be, 完全な合意で?

交感…? You might have wanted to say 同感?
完全な合意… Do you want to say “I completely agree with you.”? 完全な合意 sounds a bit different.

Switching to Local "Dialect"

My aunt said, "The shop assistant seemed to like me, saying that I reminded her of her mother. She wanted us to write (to each other), but I wasn't comfortable with the idea: she made me feel like a bar lady; calling me 'mama-san' all the time."

The differences are:
eliding "to me",
the less direct "seemed to like"　in place of "liked",
avoiding the direct "I didn't like" by using "I wasn't comfortable with (the idea/about it/with her), or better yet, "she made me feel uncomfortable; calling me mamasan all the time."
and "I felt like" altered to "made me feel like".

英語では、そう言ったほうほうがいいんですね。勉強に なります。ありがとう。

The unheralded switch from indirect quote in the first sentence to direct quote in the second was the primary cause of difficulty. Basic redaction would simply have been,
First sentence: replace the second use of "my aunt" with "her" and add "; saying." →　My aunt told me that the assistant liked her; saying, "she said ..."
BUT "... her; saying, "she said ..." is kind of ugly.

I have never heard “she said…” is kind of ugly, and “saying,” is proper.
This is very good to know. Thanks!!