I took a little sledgehammer to both headlights

The story:

At my old job, whenever this song came on the radio, I could never hear the song all that clearly, so I went over what she could've said. Little sledgehammer fit with her style of singing, but I wondered why she needed to say little, as if she wasn't strong enough to swing a regular sledgehammer, or if a little one was easier to hide. It wasn't until I was at my new job detailing cars where I could hear what she actually said...