。
She missed her hometown beyond bearing.
Literal
She [topic-は] hometown [subject-が] missing-and unbearable-was.
~てたまらない ('cannot bear, unbearably X') is an emphatic emotion construction: the te-form of an i-adjective + たまらない ('unbearable, can't stand'). It expresses overwhelming feeling. 恋しい ('missing, yearning for') is itself a word laden with emotion — distinct from 寂しい ('lonely'), which describes the state of being alone, 恋しい names the longing for someone or something specific. 故郷 ('hometown, native place') has more weight than 田舎 ('countryside'); it suggests roots, family, and place of origin.