Lol I've been reading this shit the around the same time it was still being actively updated I just decided to look through to comments for once after rereading it since a new chapter came out not too long ago but hey good job with that adorable assumption you made there trying to act special for reading a manga relatively around the time it was posted.
Since when was bitching considered a legitimate complaint. She was mentioned and initially nothing more than background for the sake of lore now actually being a character we get to see interact with the MC of course she is going have a full on background built. That's how this shit works.