Are you sure you are giving the proper dose? 0.25 ml 2 times a day is 0.5 ml per day or 5 ml for ten days. Baytril bottles we have here have 20 ml in them and that would last 20 days. Do not mix up the liquid measure units (ml = milliliters) with solid measure units (mg - milligrams). How many milligrams of antibiotic are in a milliliter of the medication? Did that perhaps gets mixed up?
However, your bird does need to be seen by a vet again, especially if the dose was incorrect as an overdose could cause liver or kidney damage. Also, antibiotics should not be prescribed without a CBC bloodwork done to confirm an infection. Please speak with your vet again and get things clarified.