My question involves unemployment benefits for the state of: CA

I was denied unemployment due to section 1256. I guess they are saying that I left my job voluntarily & refused a leave that would of held my job. I am pregnant & was put on disability for 2 months. I submitted my leave of absence & tried to return to work, however, I had restrictions from my doctor. I submitted them to HR along with my release letter allowing me to return to work & they sent me a letter saying they would extend my disability leave if I wanted & there was no modified work at this time. I NEVER quit my job & didn't apply for another disability leave of absence because I CAN and am WILLING to work. The letter they sent me says theres no modified work & they will terminate me in June if I can't return to work. I tried returning to work so now what do I do?