The blonde girl who was seen in the yard is named April Hall, and she's just moved to the neighborhood a month earlier in order to live with her grandmother, Caroline.
She used to live in Hollywood with her very glamorous mother, Dorothea. But being a very glamorous mother in Hollywood has a cost: fame. So Dorothea is on tour and won't be around for a while.
Because of this whole situation, April is rather miffed and acts coldly towards her grandmother. She also keeps trying to dress up and wear fake eyelashes like Dorothea. As you might guess, it's not the best look for a little girl.
Luckily, there's more to April than false eyelashes. When she first arrives, she stops by the antique shop and actually talks to the Professor about all the historical objects. She says how much she likes studying history and imagining what it was like to live in different times.
It's definitely a better side than the eyelash-wearing one.