Take a look at the sentence again:
After listening for weeks to her boyfriend Steve bragging about his mother's
chili, Amy anticipated the first delicious
spoonful, the hair floating among the beef and beans, however, killed her
appetite.
After listening for weeks to her boyfriend Steve bragging about his mother's chili is a present participle phrase. A present participle phrase will begin with an ing word like listening. A main clause follows the participle phrase: Amy anticipated the first delicious spoonful. When a participle phrase introduces a main clause, you must separate the two with a comma.
Go back to the sentence to try again.