I just have a 'sticky' brain.
I don't think Terri has changed her story at all. She told investigators about an hour, and they have her down as about an hour (flier).
Doesn't matter what she has or has not told anyone else - only LE - and they seem to have confirmed her 'about an hour'.
The 'few minutes' was casual conversation to a friend in an email. It's meaningless.
Desiree said in the audio interview with the Oregonian that she didn't know until the timeline articles came out that Terri'd gone to the grocery stores. So that's probably where her 'two hours' came from. IIRC, she also said in an interview that Terri didn't remember what she'd done that day or that morning (I'd have to look up the exact wording), so that tells me that Desiree is imprecise, and further discounts the 'two hours'.
The time in Dede's flier may have been to cover Dede's time only, and Terri's time was about an hour within that window. LE may also have been deliberately imprecise to get that uninfluenced memory from witnesses they've said several times they want.
Bottom line, and again, it's what Terri told LE that's important, and that seems to match to the time LE has determined.
:moo: