My 85 year old mother's mild cognitive impairment seems to be getting worse. Should I call the doctor?

She is exhibiting some delirium/paranoia. Lately she had accused different friends and family members of stealing things from her, like credit cards, her driver's license, cell phone, tools, etc. She has an appointment with her doctor in 3 weeks. Should I try to call her doctor (or the doctor's nurse) and share some of my concerns and observations ahead of time? She is currently living by herself in her own home. She is still driving. She seems to still be OK in daily tasks. But I am scared of where she is headed.