Yoga Teacher Training Forum

I have a student in her early 70's. She is not new to yoga and has difficulty getting "comfortable" in any of the basic seated positions - Easy Pose, Thunderbolt, Dandasana- as she has a slight curve in her back, almost a small hunch. We have tried just about every modification I have come across in reading, over the internet, etc., and she still is unable to find comfort in seated yoga postures on the floor. I have suggested using a chair for the seated meditations, but she is reluctant to do this. She wants to work on being able to sit more straightly while on the floor. Her flexibility has improved, and her standing posture is straighter than a couple of months ago, but seated yoga postures are still an issue. Any suggestions? Thank you, Luci