When elderly Martha discovers a murder scene next door, she decides not to report it but instead get to the bottom of it herself. She could not have predicted the series of events that would soon unfold and turn her own world upside down.

Proper names are usually not used in loglines (unless you are writing about a famous person). So ax the Martha and instead pick a characteristic (flaw) that the story will bring to the surface/force her to evolve. One sentence is better than two, and your second line is vague. Just go back to the logline formula and nail that.