She felt like a child

When Penny reached Butler Jen and Professor Singh, Butler Jen ushered the two of them to Charles' home office. Once they arrived, Penny was a little taken aback because her mother and her uncle were also in there. 

Once everyone was seated with Penny between her parents and Professor Singh across from them, Professor Singh formally asked their permission to offer Penny the apprenticeship. 

"I am aware Penny is very young and kids her age should be doing what other kids were doing at her age," Professor Singh expressed sincerely. "However, I simply think Penny is more mature and very smart for her age. And geniuses like her might find an interest in our study and research more."