My 86 year old mother is very independent. She is able to dress herself and go to the bathroom independently. She is incontinent and is looking for a product that is absorbent but that has enough “stretch” for her to use independently and that she can put on with her limited flexibility. Her knees are particularly difficult to bend. Incontinence underwear and the diapers she has tried thus far have been too tight and require bending. Any suggestions for a brand that is better for this?