ok...so if you subtract a month of off that Reagan date (the primary was at the end of February, now it is at the end of January), then the apples to apples comparison would be, give or take, October 10 or so.
That strikes me as about right for a drop dead deadline.
(unless she plans on going indy, which might well be the case...it isn’t talked about much here...but, that approach would be consistent with her “late” start, and her criticisms of the GOP [and her supporters’ criticisms of the gop])