Poor memory is a "blank" or common symptom. As Mrs Tip has shown, we must differentiate the type of poor memory they have, and if there is nothing to really distinguish it, then you must look elsewhere in the case for symptoms that are more useful for choosing a remedy.
Almost all of my patients complain of poor memory - it is often just a sign of bad health.
There are no shortcuts in homoeopathy - this is both a blessing and a curse. I feel it is much more a blessing, since we are able to really change people's lives rather than just apply a bandaid. But it makes it more difficult to sell our product.