My Colleague’s Alcoholism is Ruining Work. Should I Tell My Boss?

I've been working with my colleague for 10 years, and I’ve known for a long time that she drinks whiskey first thing in the morning as soon as work starts. For the past few years, it’s been getting worse, and it’s now unbearable. She fights with clients, argues with colleagues, refuses to do her job properly, and constantly finds problems instead of solutions. We work in customs procedures, and we need clients to bring in work and money. Instead, she’s driving them away. Because of her, we’re stuck in the same position with the same pay while I do all the work. And when I’m sick or on vacation, everything turns into chaos. I’ve tried everything—talking to her, comforting her, offering help, even being tough. She always promises to stop, but she never does. Now she just hides her drinking and lies about it. I’m at the point where I feel like I need to tell our boss, but I don’t want to be a snitch or harm her. At the same time, I can’t keep working like this. I want to make more money, build my career, and eventually start a family. What should I do? Have any of you dealt with something similar?