Isis fused with Serket in the Late Period and can also be represented as a scorpion1. However, in this very rare representation2 Isis-Serket suckling Horus is very unusually cow-headed
Copper alloy cow-headed
Isis-Serket crowned
with sun disc and scorpion
H 18.0 Late Period
© 2014 Musée du Louvre/
Antiquités égyptiennes #N 5155
Reference
1Wilkinson R H. The complete gods and goddesses of ancient Egypt, 2003, Thames & Hudson, p. 148
2None, Unpublished amulet