L.M.
I feel for you mama. I had the same problem with my 1st born. I spent what seemed like forever trying to get her to use her potty chair with hit and miss results. After about 6 weeks my mom finally to me "put a diaper on the child and leave her be. She'll go when she's ready". Conceding defeat, I did as told. A few weeks later I started finding clean, dry diapers lying beside a used potty chair! It didn't go this smoothly with my 2nd born, but you might give it a try. If nothing else, you'll both get a breather before tackling it again.