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Although aunt Aina had feed grandmother with potions and elixirs before, her condition wasn't improving because her exhaustion had yet to be healed. This is a type of exhaustion that is caused through the over usage of Magic Power, something that seems to not be curable through potions and elixirs normally.
However, the effects of Naturia's Leaves and Fruits have the effect of "Magic Exhaustion Heal", they only heal a small, fixed number of points, but if you eat tons of them, the effects stack and even grandmother, who has incredibly vast quantities of mana (which were already healed anyways) can have her magic exhaustion healed in an instant.
"I-I feel so much better now! I can even walk!" Grandmother said. "W-What was those leaves and fruits you gave me? Where did you get those, Sylphy?"
"Yeah! I have never seen a leaf or fruit have such an immediate effect." Aunt Aina said.
