Jamie Luray's poem begins with a simple idea: everyone deserves to speak, to be heard, and to sit quietly and listen, at least once. The repeated "at least once" sounds gentle and reasonable, almost like a lesson being set up.
Then the poem turns and speaks directly to "you." You are heard all the time and say whatever comes to mind. Meanwhile "she" sits in front of you, always listening and never speaking. The speaker seems to be on her side, or perhaps is the listener herself, and the tone shifts from calm to quietly accusing.
The questions near the end ("What about her?") feel pleading rather than angry. The speaker reminds us that the silent person has problems and feelings too, and that she wants the same small thing the opening lines promised: to be heard once. The mood is sad and reflective, with a pointed final question that leaves the reader feeling a little guilty.