However, the main question that should be asked now is: Where is Valkyrie in Infinity War? As it turns out, Tessa Thompson actually has a pretty obvious answer about that.
Infinity War begins right where Thor: Ragnarok left off, as Thanos takes over the Asgardian refugee ship.
Before reading ahead any further, it should be noted that there are major SPOILERS for Avengers: Infinity War contained within this story, so read at your own risk.
Valkyrie is seen chugging massive amounts of booze in Thor: Ragnarok, so her answer makes a lot of sense.