Darla owes the government $1,800 for taxes, but she has tax credits of $1,500 for childcare, $678 for earned income, and $250 for an energy-efficient home. So, the total tax credits she has is $1,500 + $678 + $250 = $2,428.
To find how much she will owe the government, we need to subtract the tax credits from the total tax owed:
$1,800 - $2,428 = -$628
Since the result is negative, it means that Darla will receive a refund of $628 from the government.
Therefore, the answer is: Darla will receive $628 from the government.