The Life of Ballālasena 2.16.3

2.16.3

śvaśrūḥ pitāmahī jyeṣṭhā dhātrī ca guravaḥ striyaḥ /
ityukto guruvargo 'yaṃ mātṛtaḥ pitṛto nṛpāḥ /
anuvarttanameteṣāṃ manovākkāyakarmmabhiḥ //

the mother-in-law, the paternal grandmother, the eldest [sister], and the nurse are female gurus.
Thus has this group of gurus on the mother's and father's sides been described, O kings;
they are to be served with deeds of mind, speech, and body.