She has to announce by the end of the month because the deadline to announce for the first primary is the 1st of Oct. I believe. Besides that she has definitely said(regardless of what you think you know)that she will announce one way or another by September, which takes in the whole month, therefore the end of the month is the deadline for more than one reason.
um, ok.
What will you do if Oct. 1 comes and she has said nothing? Besides, she might be planning on running independent....