Lunedi

Lunedì, il mio mia figlia ritorna a scuola
Monday, my daughter returns to school.

Is she happy?

E' felice?

Lunedi

Lunedì, il (possessive adjectives require always the article but for a (singular) relative without other adjectives and not overwrought, excepions: "mamma", "papà", "babbo" and with the possesive loro) mioa (make agree possessive adjective with noun in number and gender) figlia ritorna a scuola
Monday, my daughter returns to school.

Lunedi

Lunedì, il mio mia figlia ritorna scuola
Monday, my daughter returns to school.

The mistake was because you didn't accord the noun "figlia" - female, with the correct gender of the possessive adjective:

- Figlio (son), sing. m.           "il mio figlio"

- Figlia (daughter), sing. f.     "la mia figlia"

- Figli (sons), pl. m.              "i miei figli"

- Figlie (daughters), pl. f.      "le mie figlie"

Lunedi

Lunedì, il mia figlia ritorna da scuola (Lunedì mia figlia torna da scuola)
Monday, my daughter returns to school.