Hi
@Kc4, has she said why she won't take the medication? There is a huge range of possible reasons ( some more irrational than others unfortunately). Does she understand how the medication is expected to help her?, hopefully the doctor explained but it can be a lot to take in. A lot of people I talked to when I was still nursing saw decisions re medication as irreversible, reassuring her she can stop if they don't work or if they cause her problems may make her feel in control enough to give it a try. Many people also worry about side effects but in my experience memory clinic will start at the lowest dose possible to avoid these and then build up the dose depending on how your mum responds to the medication.
Good luck, everyone responds differently - my MIL saw medication as a possible cure and would have taken 10 times as many tablets as prescribed, but my mum was scared of the possible side effects - the information sheet scared her silly but she agreed to give it a try when she realised that the initial dose was very low and that it would be built up over a few weeks to a therapeutic dose.