This is the 9742nd most frequent Russian word.
шумилина
"Шумилина" is a surname in Russian and does not have a specific definition beyond being a family name.
Here, 'Шумилина' is used as a proper noun, specifically a surname, referring to an individual making a life decision.
Шумилина решила стать художником и переехала в Санкт-Петербург.
Shumilina decided to become an artist and moved to St. Petersburg.
In this sentence, 'Шумилиной' appears as the dative form of the proper noun 'Шумилина', indicating the subject of the article.
Сегодня в газете была статья о известной писательнице Шумилиной.
Today in the newspaper there was an article about the famous writer Shumilina.
Here, 'Шумилиной' is in instrumental case, implying that Shumilina is the creator of the painting.