She kept showing her bad mood in front of my parents

I was seeing, as always she kept her bad face/bad mood in front of my parents. Although, she was in fever too. 

But, as soon as they went. I could see a different smile on her face.

I felt so bad about my parents, about me. We did not deserve this.

I can count many times, when she always keep in bad mood in front of them. I feel very bad about them.

But, now they also realized this. They told me that why she always remain in tensed mood.