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I searched the Japanese Girl's Names database (110,000 names) and did not find this particular combination. The only spellings of Yoshimi which included the kanji 慶 were:

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Yoshimi 慶実 (in which 実 means fruit, to bear fruit), and
Yoshimi 慶美 (in which 美 means beautiful).

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So I concur with the previous poster that 慶身 is a potential spelling of Yoshimi but it must be extremely rare.