Robyn joined Chicago Medical Center after helping with a rare infection.
In Generation Gap, Charles notices Robyn spacing out while staring at a vending machine. He then saw her at the cafeteria where she was worriedly looking for her wallet. She claimed it was stolen and that she'd have to replace all her cards and began panicking, when Dr Charles simply checked the side pocket of her bag and found it for her.
Connor then told Dr Charles that Robyn is hearing things and spacing out, after insisting that she heard "rats" in his apartment. He had two exterminators check the place out but she insisted they were there. Charles dismissed him and told him it's normal and told him to leave, but was very worried and didn't want him to know.
Charles went to see Robyn in her office afterwards and she told him she was glad he was there. She said she had the droppings as proof that they have rats. She takes out a sealed bag with folded tissues. She unfolded the tissues one by one to reveal nothing. She stared in surprise and said she knew what she saw. Charles was upset and told her that not as a psychiatrist, but as a father he would feel better if she saw someone, and she agreed.
Charles could not treat Robyn himself, but Sarah was the one treating her under a different psychiatrist. Sarah tried building a relationship with Robyn and told her she could go home. Charles didn't agree with the decision. He went to her apartment after taking her keys and found mouse traps all over the house and the wallpapers and furniture ripped apart. He then stopped Robyn from leaving the hospital. Robyn didn't want to stay, so Charles resorted to forcing her to stay in a psychiatric hold. Sarah was angered as it ruined the trust between her and the doctors, and Robyn said she hated her father for making her stay.
In White Butterflies, a lawyer came to Chicago Medical Center to help Robyn get out of psychiatric hold, because she, Connor and Sharon thought that Charles had only put her in there because she was his daughter and he was being paranoid. Robyn argued she could live with Connor, who told Charles that he could protect her and take care of her better than Charles did. However, when they get home, they get dinner and go to sleep and Robyn has a breakdown that night. Connor wakes up when he hears something break and goes to the living room to find her hitting at nothing with shattered glass on the floor. He tries to get to her but she doesn't seem to see him and runs outside to the balcony, locking him out. He is extremely scared and tries to get her to come back in, but she screams and even tries to jump off at one point, leaving him scared and distraught as he can't do anything.