I'm editing a story right now, and they use this construction with no speaking verbs a lot:

Rachel was finishing washing the dinner plates, “I know this will be hard on them, but Shelby needs to go on home."

I know you could replace that comma with a period, but I wonder if it's common to use a comma or semicolon to avoid slowing the reader too much?

This next one makes more sense to me because laughing could conceivably be a speaking verb:

Maddie's laugh was laced with sarcasm, “Mark, looks like you’ve got a friend.”

That one could even be a colon...

Am I overthinking this? Should I just replace them all with periods?