Also, just my 2 cents, but a lot of American Girl books aren’t allowed at our house for the same reason you aren’t allowing the JBJ books. I read the JBJ books when I was young, and remember them not being okay for my kids to read either, and I think if I remember correctly they are worse than AG, but you might want to read some of those too. Kirsten, Kaya, and Addy seem mostly okay, but Samantha books are borderline and have name calling, disobedience, etc and then after that (newer character stories) just get worse.
Thanks for this post and some more ideas!