Is she rude for complaining about my low voice?

I work as an admin assistant at hospital and last time my coworker Nika threw me under the bus to my boss in a meeting that when there was a visitor my coworker Louise noticed I was talking softly to a radio and then when ambulance driver didn't hear it I loudly told it on radio she said there's inventory that day and there's visitor in our room and then she complained it to my boss without telling it to me first to fix it before telling it to my boss. I was pissed. Now my coworker Louise who is also close friend of Nika I was telling the woman instructions on how to fill up forms and I thought she said " okay" I thought she understood it and when I checked it its all wrong and Louise heard it and assisted the woman and the woman said that because " I have a low voice and she couldnt hear it" in my mind its very easy to fill up the form without me instructing it and I thought she understood it cuz she said "okay" Louise said I should raise my voice and she asked me " Do you know your work?" Do you know how to do your job?" I said yes. In my mind I remember her complaining me about my raise voice to Nika so I was always careful of speaking loudly because of that incident.
Is she rude for complaining about my low voice?
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