At first I thought she was referring to herself as "Sensei" and the self-insert character simply stops listening to what she's saying partway through the second speech bubble, but at a closer look this appears to be part of a page in a doujin the author will be releasing in the upcoming winter comiket. I'll try to remember to revisit this image after C95 scans go up online and fix this up a bit.

Zurreak said:

At first I thought she was referring to herself as "Sensei"

Upon further review of the artist's past work, it seems to me that this is indeed the case. I'm re-adding the "teacher" tag.

I can't find the doujin online, so I still can't update the text... but just in case it wasn't clear, the translation note's text is cut-off intentionally because the image's text is cut-off (and unclear).