My girlfriend is traveling from Beijing to New York City. However, she has a connection in Abu Dhabi International Airport.
Will she need to re-check/re-claim her baggage in Abu Dhabi or will it be routed all the way to NYC?
As you are flying on Etihad Airways, your baggage will be checked all the way through.
You can even avail US pre-clearance which is available at Abu Dhabi to avoid delays when landing in NYC.
If you bought the tickets together, then typically yes, the luggage will be transferred for you. If you bought the tickets separately from two different airlines, then typically no. If you are just changing planes within the same airline, always yes.