The Witches Three Cozy Mysteries 1-3 by Cate Martin

Amanda Clarke thinks of herself as perfectly ordinary in every way. Just a small-town girl who serves breakfast all day in a little diner nestled next to the highway, nothing but dairy farms for miles around. She fits in there.
But then an old woman she never met dies, and Amanda was named in her will. Now Amanda packs a bag and heads to the big city, to Miss Zenobia Weekes' Charm School for Exceptional Young Ladies. And it's not in just any neighborhood. No, she finds herself on Summit Avenue in St. Paul, a street lined with gorgeous old houses, the former homes of lumber barons, railroad millionaires, even the writer F. Scott Fitzgerald.
This box set collects the first three in the WITCHES THREE COZY MYSTERIES:
CHARM SCHOOL
WORK LIKE A CHARM
THIRD TIME IS A CHARM