Read the following sentence below from Chapter 10:
“I got a run in one of the new stockings last night. I didn’t notice it until I washed them this morning.” I could tell from the way she spoke that it was her way of thanking me for giving them to her.
“Where did you get the money for them?”
“I told you.”
“Tell me again.”
“I walked to school a few days instead of taking the bus.”
“You said you skipped lunch.”
“And I skipped lunch a couple of times.”
She mulled that over a few seconds, but she had to get to work on time and couldn’t devote her full energies to interrogating. She always makes me tell the same story over a week or so later to see if I slip up on any details.
Based on the context of this passage, mull most likely means?