A Dead Red Oleander (A Dead Red #3)
R.P. Dahlke

Then her quirky relatives arrive from Texas and things go south in a hurry: Dewey Treat drops dead, his tearful widow claims he was murdered, clobbers Sherriff Caleb Stone with his own gun, and makes a run for it. Lalla, convinced the widow is innocent, sets out to prove it—against the express wishes of fiancé Caleb Stone.
Feds, local law, suspicious ag-pilots, nutso relatives, and her daddy's new sidekick, Bruce the goat, make life a living hell for Lalla. Will her nosey nature solve the crime and save the day? Or put them all in mortal danger?