The Little Word Catcher by Danielle Simard, illustrated by Genevieve Cote

From chapters.ca:
A little girl tries to help her grandmother by finding the growing number of words that seem to be escaping her. Are the words hiding somewhere? Can she trap them in her net like butterflies? A gentle exploration of the effects of Alzheimer's on the relationships in a family, and the special bond it creates between a grandmother and her granddaughter as the young girl begins to believe that her grandmother has used up all her words and has passed them on to her, as a gift.