Answer:
Venus should increase the flame of her stove to speed up the rate of the ingredients dissolving.
Explanation:
In Chemistry, the rate at which a reaction occurs in part depends on the the energy or temperature used to facilitate the reaction.
You would notice that increasing the flame of your stove while you boil water causes the water to boil faster. This is because the increased temperature which is transferred to your kettle causes the water molecules to interact faster and in turn cause the water to boil faster.
So, if Venus increases the flame of her stove, the increased temperature would cause the water in her soup to boil more and also speed up the rate at which the ingredients dissolve.