I mean, she writes and produces ALL her songs, with exceptions of covers. No other female artist is more successful and talented in writing and producing their own material. A lot of people just know Mariah for her incredible vocals and hits, but they do not really recognize that she writes and produces almost all of them.
She reminds us of her accomplishments enough so that it doesn't really matter whether not we give her the proper dues. She'll always be there to remind us about the countless #1s, her production/writing, etc.