en_tn_condensed/act/05/10.md

fell down at his feet

This means that when she died, she fell on the floor in front of Peter. This expression should not be confused with falling down at a person's feet as a sign of humility.

breathed her last

Here "breathed his last" means "breathed her final breath" and is a polite way of saying "she died." See how you translated a similar phrase in Acts 5:5. (See: rc://en/ta/man/translate/figs-euphemism)