I encourage you to follow through on seeking a second opinion for your mother. Here in the States, one would go to a neurologist for the testing and diagnosis.
Both my maternal grandparents died with Alzheimer's. Between the two of them, the extended family (my mother, her siblings, their spouses, and we grandchildren & great grandchildren) have spent the past 20 years losing someone to Alzheimer's. It's grueling.
Now we're seeing the cycle repeat itself in our mother. She's 70, prefers to seek the care of providers who are quacks, and doesn't do her part in managing her diabetes or her ITP (a blood clotting disorder that isn't hemophilia). My sister and I have observed symptoms of Alzheimer's in her for 10+ years and repeatedly asked her to go for an assessment. Either she refuses up front (because the Lord is going to cure her), or she says she will do it and then doesn't follow through. When she does follow through, she invariably goes to one of her quacks who, not surprisingly, gets it wrong.
Further, I think it's important to your mother's health for you to be with her at all future appointments. It's good for anyone, of any age, to have someone there to serve as a "second set of ears" when dealing with serious medical issues or if one experiences medical anxiety.
As your mother's primary caregiver, you're most familiar with her routine, meals, medications, nutritional supplements, ailments, etc. As her daughter, you've known her longest of anyone. You know what is and is not normal for her. You also know when to speak up, in the event she's withholding information from the doctors & staff.
"Our past is a story existing only in our minds. Look, analyze, understand, and forgive. Then, as quickly as possible, chuck it." ~ Marianne Williamson