Jane's stay at Marsh End, also known as Thornfield Hall, and the Moor House have significant impacts on her state of mind.
At Thornfield Hall, Jane experiences a sense of belonging and love for the first time in her life when she falls in love with Mr. Rochester. However, her happiness is short-lived when she discovers that Mr. Rochester is already married. This discovery shatters Jane's world and causes her to leave Thornfield Hall and embark on a journey of self-discovery.
Her stay at the Moor House, with her newfound family, the Rivers, provides her with a sense of familial love and belonging, which she has never experienced before. She also learns about her family history and discovers that she has relatives who are willing to accept her and love her for who she is. This knowledge gives her a sense of identity and self-worth. However, she is torn between her desire to be with Mr. Rochester and her moral obligations to not be with him due to his marital status.
Overall, Jane's stay at both Thornfield Hall and the Moor House has a profound impact on her state of mind. She experiences love and belonging, as well as heartbreak and moral conflicts, which ultimately shape her character and help her to grow as a person.