ðɪs kənvˈɪnsᵻz hɜː mˈʌðɚ ðæt ʃiː ɪz ˌɪndˈiːd ˈɪnəsənt bɪkˈʌz ʃiː ɹˈiəli dɪdnˌɑːt nˈoʊ hˌuː ðə fˈɑːðɚɹ ɪz ænd dɪdnˌɑːt hæv sˈʌmwʌn ɪn mˈaɪnd tʊ ɐpˈɪɹ ɔnðə θˈɜːd.
This convinces her mother that she is indeed innocent because she really did not know who the father is and did not have someone in mind to appear on the 3rd.