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Female spotted hyenas (unlike female striped hyenas or brown hyenas) are exposed to very high levels of the male-specific hormone testosterone, which allows them to become more muscular; the female is actually the larger of the two sexes, enough to challenge and even surpass the males for dominance.
Dominant, high-ranking females will also give their developing offspring, both males and females, higher levels of the hormone androgen compared with lower-ranked mothers.
https://a-z-animals.com/blog/hyena-birth-what-makes-it-so-unique/
This is what the website says
pseudo-penis has its own important uses. Scientists have suggested there is pressure for females to appear like males because dominant females have the tendency to kill the female offspring (and therefore potential competitors) of lower-ranked females to give their own offspring an additional advantage. This would mean the pseudo-penis is an advantage for lower-ranked female offspring to literally avoid the wrath of the alpha female
https://a-z-animals.com/blog/hyena-birth-what-makes-it-so-unique/