In 2019, Ishida became a member of the subunit Sucheese, which consisted of the "next generation leaders" of AKB48 and its five Japanese sister groups, and their song "Okujō Kara Sakebu" was included in AKB48's 55th single, "Jiwaru Days".

[15] Ishida and Takino also represented STU48 in the lineup for the title song of AKB48's 56th single, "Sustainable",[16] and performed with them at the 70th NHK Kōhaku Uta Gassen on December 31.

[17] In October 2019, Yamaguchi Broadcasting aired the television program STU48 Furusato Senden LABO (STU48 ふるさと宣伝LABO, "STU48 Hometown Promotion Lab"), which featured Ishida and Takino's visit to Indonesia as Setouchi Region tourism ambassadors.

A total of 29 songs were performed, and Ishida read a letter to her fans in the end announcing her goal of becoming the "strongest idol".

[10] Ishida became title song center (lead performer) for the first time in STU48's sixth single, "Hitorigoto de Kataru Kurainara" (2021).

[29] She was also elected into the group's fan-voted Setouchi PR Unit, which would perform the song "Boku wa Kono Umi o Nagameteru" (僕はこの海を眺めてる, "I'm Looking at This Sea") included in the single.

[36] On November 23, Ishida became the first AKB48 Group member to appear on the YouTube channel The First Take with a solo performance of "Hana wa Dare no Mono?".

[2] In 2020, Tokyo Sports mentioned that Ishida's appeal lies in the contrast between her "innocent" looks and her "unexpected" variety of skills, including dancing.