Shouko could safely say she was too calm.
She was way too calm in dealing with this kind of situation.
As a person who claimed to lost five years' worth of her memory, her action right now didn't befit with her current condition. That was what had been lingering in her mind.
Right from the start, she didn't actively pester Kyoya or anyone else to know the missing pieces of her memory instead, her pace was quite poised. She was also easy to adapt to the fact that she had been married to a man for five years.
Shouko didn't take pride in being so level-headed. She just didn't like throwing herself into self-pity. Instead of burdening her mind and putting chaos within her heart, she was more prone to let the matter unfolded bit by bit.
Furthermore, her two trusted loved ones, Ono and Aunt Masako themselves had told her that Kyoya was a good husband to her. It would be a waste for her to dwell further on the matter.