If she announced now, she could still get on the ballot in about 40 states. That would be enought to win or at least cause a brokered covention, but she would have to run the table. Only internal polls can tell her is she should pull the trigger. DISCLAIMER FOR KNEE-JERKS: I do NOT think she will jump in...
Nor do I...which is why I am happy for option #2...which I selfishly laid out for her.