While JA insists she broke up with TA on June 29 of the previous year (2007) due to "trust issues," imo it's more likely TA told her exactly what he wrote in his blog, that the prospect of turning 30 made him reevaluate his life and resolve to date only those he considered marriage material.
So she knew for 11 months she would have no future with him except as an occasional sex partner. While she remained obsessed with him, I think she had accepted the fact he was never going to marry her.
Thus, I'm wondering whether the person who theorized she moved back to Yreka not just for financial reasons but was thinking about murdering him even then isn't onto something. Did she really devise the whole plot so quickly after the 5/26 text messages, or were thoughts bubbling in the back of her mind for months?
- Sneaking into AZ without anyone knowing, with no proof she was ever there: Cell phone turned off, no gas receipts
- Renting a car in a city 90 miles away rather than her own city
- Asking for a car of nondescript color, removing the front license plate (as AZ doesn't use them), turning the back plate upside down to reduce the possibility of the number being noted, either by TA's neighbors or traffic cams
- Dying her hair brown to change her appearance after renting a car
- Setting up a visit to elsewhere as an excuse for a trip
If she'd remained in Mesa, she knew she'd be the #1 suspect. Anyway, one of the first questions I'd ask her is when she first thought of killing Travis.