Actually, she can have 8 chickens per acre, according to the county. County is pretty restrictive unless you are a farm with over 5 acres.
D. ALLOWED ANIMAL CHART
Allowed Animal Chart
Animal Type
Animals ALLOWED
CATEGORY A – Swine*, Dairy Cow, Bison, Steer/Heifer, Horse or other of similar size/weight
2 PER ACRE or fraction thereof
CATEGORY B - Ostrich, Miniature Horse, Llama, Sheep, Goat, Emu or other of similar size/weight
5 PER ACRE or fraction thereof
CATEGORY C - Turkeys, Peacocks, Geese, Pheasants, Ducks, Pigeons, Chinchillas, Rabbits, Chickens or other of similar size/weight
8 PER ACRE or fraction thereof
Off-spring up to one year of age of on-site animals do not count towards the total. After one year of age animal off-spring count as adult animals. *Swine shall not exceed five (5) total per parcel.
At least they let you keep roosters.