When Catherine arrived at her house last night, her mother no longer asks her where did she go and who was with her since she came too late at around 2:30 AM. Maybe Thelma already anticipated that she was with John that is why she didn't interrogate her anymore. When she saw her mother her anger suddenly arises, she wanted to confront her how could she do something horrible to her own daughter? But she reminded herself of her mother's illness, she's trying to avoid the risk of her mother landing in the hospital again.
For the meantime, she will hide the pain and torment inside her. Thelma is still her mother after all!
When her alarm starts beeping she dragged herself inside the toilet and took a bath. Even if she doesn't want to go to work, she has to, because it's better working than seeing her mother inside the house and being constantly reminded of her sickening betrayal. It hurts so deep!
