A Quiet Belief in Sandwiches

I'm currently reading - and enjoying - A Quiet Belief in Angels, by RJ Ellory. Here's a nice ambiguity from chapter 10 of the novel:

My mother said nothing of consequence. She asked if I'd left the sandwiches she'd made in Reilly Hawkins' truck. She asked if the doctor was going to make her headaches disappear.


So were the sandwiches made in Reilly Hawkins' truck, or left there? The latter, presumably, because making sandwiches in a truck is neither a common nor a simple operation...