Enter Gabby and the House of Hope about a year or so after the last Yada Yada Prayer Group book was published. I reviewed the first book here, and then I borrowed books 2 and 3, finally getting around to reading them in January.
The fourth book in the Yada Yada House of Hope series is entitled Who is My Shelter? and you can find out more about it on the author's site here. It was a very satisfying conclusion to the series, but I'd recommend reading the first three for full enjoyment.