What was Hera last known location?
Hera was a goddess and omnipresent. To assign a "last known location" implies that she had a physical form that could be attached to a single location. The Greeks did not see their gods this way.
In Roman Mythology, Hera is known as Juno. Goddess of Marriage, Women and Childbirth. Hera (Juno) can be resembled as a Cow or a Peacock. Hera was known for her jealous and vengeful nature, most notably against Zeus's lovers and offspring, but also against mortals who crossed her, such as Pelias. Paris offended her by choosing Aphrodite as the most beautiful goddess, earning Hera's hatred.