From the clips I've seen, the little actress does a great job as bratty Rachel.
About 10 years ago Y&R had 2 different little girls playing a character named Faith. One played her really sweet (we called her Curly Faith because she had curly hair). She normally played Faith, but had booked a few outside projects so they got another little girl temporarily. The other little actress played Faith as a brat (very well, too) and we called her Evil Faith. When Faith's dad Nick dated a new woman, Faith acted just like Rachel is doing now.
Side note, the little girl who played "Evil Faith" is now Sheldon and Missy's friend, Paige, on Young Sheldon.