What can i infer in this sentence She walked quickly her heart thudding and her face half hidden behind her fan sweating in the december heat. she had brought her little velvet bag with the jewels of her trousseau

To infer is to assume an action. you can infer she lives in Australia (south of the equator the months are opposite) you can infer she was panicked / excited (heart thudding) you can infer she is wealthy (HER bag of jewels suggests she did not steal it)