Dear SueScott...I love your concept of Chloe reading the Bible under candlelight. Having experienced the very same problem as your inability to get a sharp focus on her face in low light, made me wonder two things,
#1- When you take advantage of trying that same concept again, is there any way that you could add additional soft constant lighting only on her face, like portrait photographers use called a tube light. A used old oatmeal tube with a light bulb behind it, held by a friend assisting you, standing just out of frame will work. You could leave the candle in place implying that is the lighting, and still allow you to achieve a much better sharp focus?
#2- Can you choose to have your camera on a tripod so that you can arrange everything just like you want, before gently pressing the shutter having eliminated any possibility of camera shake?
I predict you will have created the same crisp image as the beautiful stained glass church window ypu captured, as well as an excellent image that not only pleases Chloe, but also tells quite a story that you can share with your family and friends at your church You do very nice photography work!