To find out how much money Reem has after paying her friend back, we can subtract the amount she owes from her earnings.
Reem's earnings: $43.78
Amount owed to her friend: $15.25
Now, perform the subtraction:
$43.78 - $15.25 = $28.53
So, after paying her friend back, Reem has $28.53.
Therefore, the correct response is:
$28.53