Translation:If Julia eats then Neha will also eat.
If Julia eats then Neha will eat too/ If Julia eats, so will Neha...
Both of these should also be accepted here.
"If" and "will" (as a future tense marker) don't go together in a conditional clause. The only exception to this rule is when the action in the if-clause happens after the action in the then-clause.
I agree that the English version is not correct because of the first use of WILL.