Books similar to the Babysitter’s Club?

I am hoping to find books similar to the Babysitter’s Club for a 12 year old girl. She loves them. She has read all the newer ones and the older ones I found her. She is not a huge reader outside of school otherwise. She is sensitive. I do not want anything too dark. She is also anxious so nothing that will teach her new fears. She is in middle school, smart, loves to dance, plays multiple instruments and is a quiet girl