Yes, a wise woman understands the value of a minyan, but as she is wise, she might find other things to do at the same time. And osek b’mitzva surely patur min not hamtzva!
for example, a learnt woman would know that a temporary minyan at the chatuna does not require mechitza, but she also knows that the primary reason for coming to the wedding is to be mesameach chatan and kallah and, given that at current weddings men are machmir to not allow themselves near the kallah, women need to fully attend to that mitzvah – and also to the mitzva of reviewing potential shidduchim for their sons, as, again, sons are not allowed to do it themselves.