Suppose Two sisters, Natalie and Sarah, are planning a surprise party for their mother's birthday. They have decided to bake her favorite cake and decorate the house with balloons and streamers. On the day of the party, they blindfold their mother and lead her into a room filled with her friends and family, who shout 'Surprise!'.
Can we infer that "Natalie and Sarah are planning a surprise party for their mother's birthday"? Yes, no, or maybe?