what happened?

A few weekends ago we were working in the basement. Mikayla was playing in her exersaucer and Jennifer was busy moving from thing to another. I helped Bill carry something upstairs really quick and came back down to this...

Mikayla with a blue cheek? Whatever could have happened?

Could it have been this hat wearing mystery girl?

Will we ever know the truth?

The mystery was quickly solved because when asked what happened to Mikayla's cheek Jennifer was quick to show what she had done.