My friend has form for this.
Instance 1: we agreed we would go halves on a service that we both needed. I paid for it upfront (£90) and she said she would transfer. Took about a week and a half.
Instance 2: I mentioned I was going to a shop, she asked if I could pick up some pet food for her and she would 'send the money immediately' to the total of £50. Again took a week to get the money.
Last week: I mentioned I was selling something and she asked if she could have it. We agreed on a price (£60) and I said that I was passing her way, so I could drop it off for her. Low and behold, a week later I still don't have the money.
I know it's 'only' a week, but I need the money (which is why I was selling).
Have sent a couple of text reminders but have received nothing back.