My grandma was a fan of Emilie Loring's books. They are basically all gentle reads (not religious). All involve a plucky young heroine whose values, sense of humor, and sense of responsibility are intact. The heroines all face some sort of trial, usually involving a mystery - sometimes a murder - and all the heroines find their true love.
Most of these are what might be called "quaint"; they reflect the values of the author from the 20s through the 60s. There are some elements that might be called racist, classist, and sexist today, but these are minor issues. The stories are the main attraction and are interesting.
After my grandma died, I found copies of the Loring novels that she hadn't beem able to collect (there are 50 in all), and since then, I've read each one and enjoyed most of them. If you're looking for a good, spirited, gentle read, try one of these.