Why did Mrs. Packletide wish to kill a tiger

Why did Mrs. Packletide wish to kill a

tiger? 

Mrs. Packletide wished to shoot a tiger in order to get her pictures published. She wanted to outshine Loona Bimberton, who was a boastful lady.

Loona had a joy-ride in an aeroplane and she kept on boasting of her adventurous trip. This was the cause of jealous for Mrs. Packletide and she wanted to do something more exciting and adventurous than her. 

Ultimately, she planned to kill a tiger to get name and fame.