According to one newspaper report (The Sun in UK), she text him around 1.00am suggesting he joined her at the pub. He said he was asleep and didn't notice the text till later. So, I guess she thought there was no point phoning him, as she probably guessed he'd slept through the 1.00am text.
However, it does get me thinking ..... funny time to text your husband to join you, 1.00am. She'd been out all night straight from work, so could have asked him along much earlier. Was it because someone she was with was making her uncomfortable, and she thought she'd feel better if her husband was there. Maybe someone was coming onto her?