Little does she know her true rival lies before her... A rival IN LOVE
Nah imagine confiding in a robot you think is human- actually I don't think she was unable to tell the difference, she just found the robot more convient, yes but of course
Have nice day
I mean...the fact she even ended up confiding in her, and was actually somewhat worrying about her, means that she CAN be able to care for other people, so long as she feels they both don't step on each other toes too much.
But since Satoko is not only an airhead but massively self-centered (implication from how she can't remember shit about anyone she knows, barely seems to remember what Konoha says to her at times)/forgetful, Konoha can't bring herself to feel comfortable with Satoko. She steps too harshly on her boundaries, and doesn't make her feel particularly good with her company, really only keeping her around because of her need for her.
Basically, Konoha is incredibly sociopathic, but still human to some degree.