u/Metamorphoses-007

Guys, looking for potential suggestion, my wife's workplace supervisor has been extremely mean the last couple of days. The other day her supervisor was literally screaming at her for no reason at all, ended up saying she doesn't like her particularly. Was slamming stuff at her desk. A few days earlier the same supervisor told a colleague of hers "the food looks as awful as you". My understandjng is this shouldn't be the norm here and what is the best course of action for such thing? I would love to help her out, she's been very stressed cause of work.