When Sarah finally went back to school she had the mathematical, scientific mind of her Dad and was a couple of years a head in her understanding of these thanks to Tony home school her. As he knew from the start she was very intelligent in these subjects and taught her further. However she still went into the 2nd grade as for her other subjects she was still at the level of understanding of a child her age. Even from the countless hours of reading Sarah and Tony did together, you would have thought her reading was at a higher level. In her class she sat next to a boy, named Bobby. The same one she met on her first day at nursery. This time round they got on a lot better. He was Sarah's only friend, but that didn't bother her as she was a quite child. He had mostly grown out of his soft curls, but there was reminisces of them. They went together like black and white, they made up for what each other lacked in.
At the age of 8 Sarah noticed something about herself. After all the nights of waking up in the middle of the night because of a storm, nightmare or the thought of someone being in or outside her room; she could hear things really clearly. I know this is a normal thing for a child. But I mean really clearly, like conversations that were that were happening across the room however she hear them like they were right next to her. She also noticed she had very good spatial awareness. She knew when something was going to fall before it did as an example of her level of awareness.
Her being able to do these came from her true mother. Before giving birth to her, the experiments that had been performed on her, also had effected the baby, this being Sarah. When Steve and Tony took her in, she had no powers, but the serum made it so she could also have enhanced abilities. With this she was able to have her high level of hearing and spatial awareness.
At her age she did nothing about it, not even tell her Dads and this was something she did all the time. Tell them every single detail of her life. Being the genius she was; just like her Dad, she started to play about with her abilities. By the age of 10 she could see sound. Odd I know. What she had done was developed her spatial awareness so well that she sense the sound waves moving around her. The reason for her being able to do these in the first place was due to her being an anxious person and how she was worrying about everything.
She finally decided to tell her Dads around her 11th birthday. They weren't mad at her for not telling them. If anything, more surprised as this was coming from Sarah. But they were ok with it and Tony was even more proud of her as she had developed her abilities further by herself at the age of 10. This did change her life, but it won't affect her for another few years when Steve had decided to train her to defend herself, along with the help of her Auntie Tasha and Uncle Clint. You know, S.H.I.E.L.D.'s best two agents.