Why Annie is frustrated when her two weeks of isolation with Helen come to a close

Anne Sullivan was frustrated because she felt that they need more time for Helen to learn how to communicate and behave effectively. At the begging, Anne's work at the Keller's house was constantly interrupted by the stubborn attitude of his father, in attending all of Helen's demands. As a result, Anne requested an isolation period with Helen. Helen's father sent them to a nearby property for two weeks. During this time, Helen learned some words by spelling it in her hand. Additionally, Anne taught her some basic rules of behavior such as table manners. Despite this remarkable progress, Helen was just repeating the spelling taught by Anne. Within two weeks, Helen's parents went to bring her back to their home. However, Anne felt that more time was needed for Helen to learn how to communicate by herself.