i look for an announcement around that time but I would say she can wait until labor day as long as she conitnues to do what she has over the last 3 or 4 weeks and make sit clear she is still in the race. I would hope she starts visiting IA, NH, and Sc soon regradless of her announcement....
If she waits til Labor Day the grade will be too steep.
Sometime this summer is as long as she can wait.
I think she's in now...but won't announce because she wants to keep raking in the dough.
And, she is raking it in.