In this case, it's absolutely ridiculous! Using botox for cosmetic reasons on a little kid is absurd. She should be investigated by child protective services.
Botox does have other medical uses. My daughter had a stroke almost 3 years ago when she was 11 (long scary story). The only issue she still has resulting from the stroke....she has very limited range of motion in her left ankle. We just started having botox injections to help with this. Hopefully, it will work.