I believe that the show is Motherland: Fort Salem
Motherland: Fort Salem follows Raelle Collar, Abigail Bellweather, and Tally Craven, three witches who accept conscription into the U.S. Army. They train in combat magic and use their vocal cords to enact "seeds" or "seed sounds", layering vocal sounds to create powerful spells.
The episode you saw was S1E5/6 "Bellweather Season"/"Up is Down"
On her wedding day, there is a Camarilla attack and Charvel is brutally murdered - her throat was slit and she was discovered bled out in the bathtub with her vocal cords removed.
