In Modern English, she is a singular, feminine, third-person pronoun.
In Standard Modern English, she has four shapes representing five distinct word forms:
she: the nominative (subjective) form
her: the accusative (objective, also called the 'oblique'.) form; the dependent genitive (possessive) form
hers: the independent genitive form
herself: the reflexive form
Old English had a single third-person pronoun – from the Proto-Germanic demonstrative base *khi-, from PIE *ko- "this" – which had a plural and three genders in the singular. In early Middle English, one case was lost, and distinct pronouns started to develop. The modern pronoun it developed out of the neuter, singular in the 12th century. Her developed out of the feminine singular dative and genitive forms. The older pronoun had the following forms:
The evolution of she is disputed. Some sources claim it evolved "from Old English seo, sio (accusative sie), fem. of demonstrative pronoun (masc. se) 'the,' from PIE root *so- 'this, that'" (see the). "In Middle English, the Old English system collapses, due to the gradual loss of þe and the replacement of the paradigm se, seo, þæt by indeclinable that."A more likely account is what is sometimes called the ' Shetland Theory', since it assumes a development parallel to that of Shetland < OScand. Hjaltland, Shapinsay < Hjalpandisey, etc. The starting point is the morphologically and chronologically preferable hēo. Once again we have syllabicity shift and vowel reduction, giving [heo̯] > [he̯o] > [hjoː]. Then [hj-] > [ç-], and [ç-] > [ʃ-], giving final [ʃoː]. This does not lead to the modern form she /ʃiː/. "So any solution that gets [ʃ] from /eo/ also needs to 'correct' the resultant /oː/ (outside the north) to /eː/. This means an analogical transfer of (probably) the /eː/ of he." None of this is entirely plausible.
The -self forms developed in early Middle English, with hire self becoming herself. By the 15th century, the Middle English forms of she had solidified into those we use today.