This is from Wikipedia "Aoxomoxoa" site:
A five-year-old
Courtney Love appears on the album's back cover.
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And from this it is taken to Wikipedia:
Comment: I spoke with GRATEFUL DEAD historian DAVID GANS, and was able to
confirm the old rumor that COURTNEY LOVE does in fact appear on the back
cover of the 1969 GRATEFUL DEAD album cover, AOXOMOXOA. She was 5 years
old in the picture. DAVID GANS said: "CCOURTNEY LOVE did in fact appear
on the back cover of AOXOMOXOA as a child. Her father was HANK HARRISON,
one of the band's managers in the early days of the GRATEFUL DEAD."
It is a messageboard, so I don´t know can anyone rely on this...