That was Ofglen Two, before her tongue was cut out, MrStark is right. I remember her saying it, but I think then the reality of that life started to hit home, because it was also Ofglen Two who shouted at Aunt Lydia that they couldn't stone Janine, and she did that before June dropped her stone.
Janine's background was being gang raped at age 14 and she had a termination, and she was made to "confess" the rape and termination as her sin and was shamed for it by Aunt Lydia, with the Handmaid's forced to join in. I think I remember them sitting in a circle saying "your fault, your fault, your fault" to her.
They used shame and violence to break her down. In the book she had a daughter who was taken from her, in the series I think it's her son that was taken, but in both they use her rape against her and break her mind down.
She thought Commander Warren was in love with her, so was happy because she thought that would mean she could keep Charlotte, so she was different to Ofglen Two who knew what was going on but at first found it preferable to how she used to live.