It's not up to grand jury witnesses to decide that.

It is for all men and women of good conscience to decide that. The jurors should refuse to cooperate and leak statements to that effect to the press. The prosecutor should resign. The prison guards should leave the doors open for her. etc.

Apparently it is.

Because she is refusing to testify, and it is producing significant public backlash, and she was released eventually anyway.

Seems like it worked out fine for Chelsea.

The release was always going to happen eventually. Contempt is not a life sentence, in the US it isn't punishment but coercion. When the opportunity to testify is over, they let you out because they have nothing they want you to do any more. Doesn't stop them from serving you with another subpoena though.

The subpoena Chelsea was served with before release indicates that she will be right back in the same position in short order.

The grand jury expired and was not extended. "Public backlash" had little to do with it.