Seems the next time she used her phone would have been heading out the second time to ABC at 12:31-32 (Hypothetically). Where she wanted to document where she was.
Yeah that makes a lot of sense hey. At 11.44 she now suspects Dan is dead. Yet she doesn't touch her phone again until 12.27pm... She would be completely adrenalised, I can't imagine her not touching her phone unless she did not take it. So she drives to Trescott and if there are no police, she comes home and as far as cell tower information goes, she never left the house. That fits well. Her whole morning was a hive of activity, dozens of phone calls and texts and TV repairs and work. Then 30mins of silence. Something happened in that 30 minutes.
Be interesting to see if there was anything on her computer that shows she was at home.