Miss Lark is a minor character in Mary Poppins and its sequel. She's an elegant woman who has a dog named Andrew. At the beginning of the original film, Bert mentions that "Miss Lark likes to walk in the park with Andrew," which shows the reason for her presence there during his musical performance as a one-man band.
Behind the scenes
Sudha Bhuchar makes her Disney feature film debut as Miss Lark in Mary Poppins Returns. As a Tanzanian-born British Asian actor, playwright, and cofounder of the Tamasha Theatre Company, she is best known for writing numerous screenplays in television and film.
Miss Lark is seen watching Bert's performance. As Bert approaches her, he gazes upon her pet dog Andrew before Bert continues performing in front of the people just as she and the other leave after good performance before Bert arrives at Cherry Tree Lane. She and the other people later witness a strong wind across Cherry Tree Lane just as George and Michael notice Mary Poppins arriving on the street. She is never seen again afterwards.
Miss Lark appears briefly appears during the part where Annabel, Georgie, and John hang out at the park just as Georgie mingles with her pet dog Willoughby while Georgie sees a balloon saleswoman from a distance. She later appears when her dog goes after the runaway kite that Michael used to own. Furthermore, she appears present during the part where everything else is being packed up just as she says goodbye to Willoughby. Miss Lark later appears during the musical number "Nowhere to Go But Up" alongside her dog Willoughby where she and her dog float via balloon.