"Oh my God, Mom...Dad, you, too, are loved by me. That's why I didn't tell you immediately and thought of keeping it a secret. But given what transpired with Crystal during her time as Ava Go and your lack of interest in helping to find a treatment for her mind control, I believed it was the only way I could assist her, Mom. Only if you knew that she's your biological daughter would you do your utmost to find a cure."
Claire felt ashamed for declining to help Dr. Garcia when she was asked. But the only reason was that she didn't want to help. She wanted to perfect the serum for who she thought was their daughter, Crystal.