My friend keeps on getting drunk in front of me it it starting to ruin our friendship what do i do?

My friend is very pretty and nice. Ever since last month she started to get a bud light whenever we go to a restaurant, now when i go to her house she offers me a beer, wine, or scotch. While she is drinking one. I look around her house when the living room and her kitchen is filled with empty bottles. I seriously do not know what do. :(