Home Is Where the Witch Is by Louisa West

She thought it was time to settle down, but instead she’s helping settle scores.
In this enchanting conclusion to the whimsical series that blends the charm of Practical Magic with the warmth of the Gilmore Girls, Rosie finds herself on the brink of a magical new chapter. She prepares to take on motherhood for the second time alongside Tammy, but the tranquility of Mosswood is shattered when the Council of Witches descends into a heated election.
While the Council navigates political complexities, tragedy strikes as one of the candidates is found murdered. Rosie, determined to protect her growing family and the magical community she holds dear, takes on the unexpected role of investigator. Juggling the demands of impending motherhood and unraveling a web of magical intrigue, Rosie races against time to uncover the truth.