she could be held in contempt, but if commenting on questions which could incriminate her, she can absolutely plead the fifth, and appeal the contempt charge. you cannot be compelled to give evidence that's self incriminating, you can be offered a deal for your testimony, but you cannot be compelled. that's what taking the fifth means. you can't be compelled, but you can be asked, and if you refuse to testify on fifth amendment ground, the government simply has to make the case without your testimony. this is middle school social studies stuff, man.