Dr. Toadley's intern
From the Super Mario Wiki
Dr. Toadley's intern is a female Toad and the nurse of Toadley Clinic during the events of Mario & Luigi: Bowser's Inside Story and its 3DS remake, Mario & Luigi: Bowser's Inside Story + Bowser Jr.'s Journey. She first appears in the Conference Hall at Peach's Castle for a conference about the blorbs at the beginning of the game. Later, she is at Toadley Clinic when Mario and Luigi come in to see Dr. Toadley at the same time. She states that only one patient at a time would be able to see the doctor, though Mario and Luigi fake having the blorbs in order to see Dr. Toadley together.
Later, she reappears when Birdley is going berserk around the air leak. She asks the plumbers to catch Birdley, which they do using the Balloon Jump technique. After the Toads are cured, Mario and Luigi can talk to the intern for the ten Toadley Clinic Attack Pieces that combine to make the Mighty Meteor Special Attack.