Zeus, king of the Greek gods, was not mentioned in this week's parsha, though the Greeks did, for a time, occupy Palestine. His appearance as YHWH's confessor is a device to let us put words in her mouth about how she might have felt about this week's shocking turnaround in her relationship with Moses.
Zeus is also our way of emphasizing one of the things we notice most in this year's parsha reading, the VERY polytheistic nature of our Torah. But that is for another discussion and perhaps another god.
a & s