How do I know? Because I have spent many decades ( more than I'm going to tell you ) not only reading and studying such ancient works as THE ILLIAD, THE ODYSSESY, and THE AENEID, but also being fascinated by ancient history and archeology.
Sappho wrote poetry, but she was the anomaly and she, unlike the ancient male bards, did NOT travel around and perform, as Homer and others did. In ancient Greece, women were, for the most part, neither seen nor heard; they were there for BREEDING. Oh, there were the temple prostitutes, regular prostitutes, the houri ( who were something akin to Japanese Geishas ), slaves, and priestesses, but they were most assuredly NOT "bards"; which is what Homer was.
I'm glad, nopardons, that you feel sure of these things: that Homer travelled around, that Sappho was an anomaly, that women in ancient Greece were for BREEDING. It's good to have certainties. I admire your decades of reading ancient Greek and Latin (I claim 37 years of Greek, which isn't much) and yet I'm still uncertain of some of the things you're certain of!