As a single father, I really have a short thing to say to you. Try harder dum dum. Your a great father only ONE DAY A WEEK! Try parenting full-time by yourself, and you may find yourself all of sudden running late everywhere you go. And that oh my, you might actually have your daughter miss school.
Please don't take this as defending your ex, but a dose of reality, I don't know her or would care to as my ex is useless.
Keep in mind that eight days in two months, the common flu last 3 to 5 days, so I would like to think it be uncommon. The main question I have for you if you ever read this: Are those 12.5 absences excused or unexcused?
Extreme amounts of absenteeism do have to be taken care of.
But rather than sit hear and listen to you whine like a little girl about...why don't you step up to the plate and offer a helping hand? She is YOUR daughter, both of yours and it is BOTH of your responsibilities to ensure she makes it to where she needs to be. Whatever you do DO NOT pat yourself on the back because YOU manage to get your daughter to school only ONE day a week, yeah thats good blah, step up and be a REAL DAD!