You might be amused when you first hear that a teammate is skipping practice because she’s too hungover. Then you ought to be concerned, realizing this is a sign of Alcohol Use Disorder.
“Alcoholism” is a non-medical term people use to describe someone with a drinking problem. “Alcohol Use Disorder” is a term doctors use to describe, “a chronic, relapsing brain disease characterized by an impaired ability to stop or control alcohol use despite adverse social, occupational, or health consequences.”
Indeed, skipping practice because you’re hungover is an occupational consequence. A mild consequence in the grand scheme, but a consequence nonetheless. The consequences become exponentially greater if that behavior is left unchecked.
If you know that a teammate skipped practice because she was hungover, I think you ought to tell someone.
[PS–I’m reminded of a quote from professional surfer Laird Hamilton on the advice he’d give to his 30-year-old self: “Stop drinking now. Stop drinking right now and patent all your ideas . . . and exercise compassion every day.”]