Thank you for your query,
Nothing to worry regarding the onset of early puberty
Adrenal production of the androgen may occur as early as 6 year of age , with the development of underarm odor and fiant hair (adrenarche).
And the early and the first sign of puberty is the appearance of breast buds, between 8 and 12 years of the age.
Nothing to worry, but you can discuss with your Peidatrician regarding this issue in her next well child visit.
Hope I have answered your query.