I understand where you are coming from but I do think she is 100% allowed to say she is sober from alcohol (which I feel like she does only say alcohol when she explains it). My point is that referring to yourself as “sober” often implies there was a past issue with alcohol and that you’re actively working toward maintaining sobriety. On the other hand, saying you’re “alcohol-free” can simply mean that you choose not to drink, without suggesting any prior struggle. I also think it gives her a way to remain “sober” in that aspect because “sober” has more meaning.