I hope they leave the toddler age soon, I really don't like the whole "speak whole sentences" thing. You can say it's reasonable because internally she's older but she's limited by the muscles and physique of her current body so shouldn't that apply to her brain as well? A child's brain, especially a toddler's, isn't as developed as an adult's. Honestly though, I just find it cringe-worthy to see.
Also, they regard her as a genius now, but when she catches up to her actual age... She'll be more mature than before but she won't be a once-a-lifetime genius anymore. Wouldn't it be better to pace herself and practice speech in secret?
The family and servants are adorable though.