Who was the Ursuline sister who documented her experiences in New Orleans after arriving in 1727?

The Ursuline sister who documented her experiences in New Orleans after arriving in 1727 was indeed Madeline Marie Hachard. She played a significant role in the early history of the city by providing insight into the lives of the French settlers and the indigenous people of the area. Her writings are valuable historical sources that depict the challenges and daily life encountered in the early years of the settlement, including details about the local culture, religious practices, and the mission of the Ursuline nuns to educate and care for the community.

The other individuals mentioned do not have the same connection to the Ursuline Order or the specific documentation of experiences in New Orleans. Elizabeth Real's contributions or experiences are not as widely recognized or documented in the context of early New Orleans history. Antoine Crozat was a French financier and the first proprietor of the Louisiana territory, and Sieur de la Salle was an explorer who played a role in early French exploration but did not specifically document the experiences of nuns or settlement life in the city. Therefore, Madeline Marie Hachard stands out as the correct answer due to her unique position and contributions during that time.