You've actually got to go back and read the transcripts of those interviews to gain some understanding of the context in which she made those statements.
I listened to those interviews, and in both cases, she was being pressured to give an answer. In the first interview, she didn't even state the time frame herself - the interviewer did, and she sort of agreed with them, that that would be a good time to announce.
In the second interview, she actually gave the time frame of late September - early October, herself.
It's sort of unfortunate, but it's a necessary component of her strategy to stay mum about WHEN she'll make her announcement. I understand that that bugs some people (most especially the MSM), but this bit of mystery is the keystone of her strategy.
If she disagreed, then she should have said so. Since she agreed, then that is what she believes.