Mrs fix it with no clue

Hi, I will be moving my mother in law in with me and my husband near the end of july. She lives in tx and has limited dr. available so we felt califor. would be better. I havn’t a clue what to do first. She was diagnosed in March and is doing rather well in her recovery. Yet yesterday was diagnosed with Osteo Arthritis yet could not get apt to see a dr. till Sept. So my first mission is to find a dr. here to refer her to an arthritis dr. I got the name of a dr. in my area but he’s not returning my phone calls. I’m in Van Nuys Calif. help me please.:confused: