The Levy collection has these pieces.

(1) Title: Oh! I'se So Wicked.
Composer, Lyricist, Arranger: Words and Music written By Geo. C. Howard.
Publication: New York: Horace Waters, 333 Broadway, 1854.
Performer: As Sung By Mrs. G.C. Howard in her Original Character of "Topsy" in Uncle Tom's Cabin.

(2) Title: Oh! I'se So Wicked.
Composer, Lyricist, Arranger: Words and Music Written by Geo. C. Howard.
Publication: New York: Horace Waters, 333 Broadway, 1854.

(3) Title: The Songs of G.C. Howard. O I'se So Wicked.
Composer, Lyricist, Arranger: Words and Music by G.C. Howard.
Publication: Boston: Oliver Ditson Company, 1882.

Lyrics & midi are at Public Domain Music: Minstrel Songs, Old and New.