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Apoe 4 gene
If you inherit two copies of the apoe4 gene your risk of developing Alzheimer's disease are greater than if you inherit one copy of the apoe4 gene. Having two copies of the gene does not guarantee memory loss, however.
The role of the apoe4 gene in Alzheimer's disease has been subject to a lot of debate. The best explanation of its role may be this: apoe4 increases the size of lipid rafts (composed in part of cholesterol), which amplifies the effects of triggers that lead to the onset and early progression of Alzheimer's disease.
The apoe4 gene is not then itself a trigger for Alzheimer's disease but instead amplifies the impact of primary triggers such as diabetes or exposure to high levels of air pollution and secondary triggers such as misfolded amyloid and tau proteins. In part, this explains why one person with one or two copies of the apoe4 gene can develop Alzheimer's disease while another does not.
Wishing the best for your mother and you.