Your oshi loves you, you are a valuable member of her community and things wouldn't be the same without you. Without your superchats, or your funny or supportive comments, or your views something would feel off. If you were to leave someday, she's going to start wondering what happened with you, if she did something to piss you off, if you are going to come back someday. She remembers you. Streaming is a big part of her life, and by extension, you are a big part of her life as well, a piece of her happiness. That is why your oshi loves you.