For this, you will need to be able to do her accent she has to her voice since she is deaf, so please watch the voice example included below! You will also be voicing her younger self as well!

In her youth, Shōko had a strong desire to connect with people around her. However, due to difficulties communicating, she was often met with misunderstanding, disinterest, or bullying. Her hope of making friends was symbolized to her by the communication notebook she brought to class, and she temporarily gave up this wish after Shōya tossed this book into the school’s pond. After facing isolation of both external and self-imposed varieties for many years of her life, Shōko has become a melancholic and self-loathing person in her late teens. She is plagued by guilt over what she sees as her own role in the dysfunctional situations of her past, including both her school and family life, and she has developed a tendency to blame herself when things go wrong even when she alone is negatively affected. Due to her lack of confidence in her own perceptions and desire not to be a burden, she struggles with avoidant behaviors, which ultimately exacerbate her feelings of guilt and inadequacy. However, these negative feelings are usually hidden beneath the more obvious positive parts of her personality.

At her core, Shōko is a kind and compassionate person who is rather easygoing. She is shown to be very patient and forgiving, even to her former bully Shōya, whose friendship she earnestly accepts when years later he expresses regret at mistreating and failing to understand her. She also expresses a caring and nurturing side, as seen when she tells Shōya that it makes her happy to give others what they need. Although her disability makes certain parts of her life difficult, she never feels the need to be pitied or treated specially. Being a visually focused person by necessity, Shōko has a fondness for visual metaphor and symbolism. Contrary to most people's expectations, she is rather analytical and perceptive, and she is usually quick to discern the content and subtext of conversations even when they are not signed to her. However, she tends to lack confidence in her own judgments of social situations, which causes her to highly value others' honesty, even when that honesty is harsh.

It is through her growing friendship with Shōya that Shōko embraces more of herself and starts to express her emotions more openly, revealing moments of anger, sadness, and genuine happiness. After being saved from her lowest point, Shōko chooses to confront her negative feelings and starts accepting the value in her own life even with its imperfections. After assuming this more realistic and proactive mindset, she finds greater success enriching the lives of the people around her, finally achieving her desire to be a source of strength for others. 

If you could sound similar to her English VA, Lexi Marman Cowden, that would be great, but it is not required!

English VA Example: https://youtu.be/u8Ip6KBDdQY -Spread throughout this video