What is the role of Jocasta in the play? Positive or negative?

Jocasta is the wife and mother of Oedipus and queen of Thebes. Before marrying Oedipus, she was married to Laius. She commits suicide at the end of the play, perhaps in guilt that she left Oedipus to die as a baby, thus precipitating his course towards a tragic end for their whole family. She isn't "positive" or "negative" rather than an example of maternal guilt at a time when women had little choice but to obey their husbands, especially if their husband was a king.