score:2
She should be fine.
She should check in for her US > Israel flight using her Israeli passport, and check in using her US passport for the Israel > US flight.
Timatic (the IATA database used by airlines to ascertain if a passenger's documentation is sufficient) states her US passport must be valid on arrival:
National USA (US) /Destination USA (US)
USA (US)
Passport required. - Passports and other documents accepted for entry issued to nationals of USA must be valid on arrival.