Finding a rheumatologist (loved one/caregiver)

Hi everyone, I hope this is ok here, if not I’ll delete. My mom has been diagnosed with lupus and although everything seemed to be under control for some time, it seems to be getting worse now. She sees a doctor in Allen TX that she’s not getting much improvement out of. The issue we’re facing is she has HMO insurance and when asking around, so many places don’t accept it. Does anyone here know of a good rheumatologist in the Texas area (preferably Dallas/garland area) that takes HMO insurance (if it helps she has Molina). Any advice would help. Thank you in advance.