The Sixth Spell by Michelle M. Pillow

You can always go home…but sometimes home won’t let you leave.
At forty, Kari Grove knows she should be over her strict childhood. The grandparents who raised her had never been loving people. But some feelings are buried deep and contain more dark secrets than even she realizes.
Even after death, it would appear her grandmother isn’t done controlling her life. (and that’s putting it mildly)
With the help of new friends and a love interest her grandparents would have hated, Kari must finally learn to stand up for herself and unravel the tragic mystery of her past.
Heather, Vivien, Lorna, and Sue are back! With the help of Grandma Julia’s ghost, they’re kicking supernatural butt and taking names.