All Americans please answer me. Is this racist?

This girl I work with is from czech republic and has been here for 8 years. She married a black man and has a biracial daughter and everything. Well she belittles people at work and tells them they are stupid and acts all rich because her fiance has a decent job. He doesnt make more than 60000 grand a year, but she is always telling us that our houses are to small and and cars are beat up! She just started doing this since she began dating this guy. The worse part is that she doesnt have a big house or a nice car. Now I have a new car and she says she needs to get one. Well when she belittles us at work she says "You americans cant take anything" or "you americans sugarcoat everything" Americans buy what they cannot afford" its just keeps going on about how us americans are so stupid....so on and so on....Is it me or are those racist comments. She only says that after she makes someone cry because she is so rude! How do I deal with this at work? No one wants to be around her anymore...She even made our boss cry today by yelling at her and saying she makes us all unhappy! Which is not true, she is actually very nice and easy to talk to. Shouldnt they send her to a seminar or something about communicating effectively?