She should check her school handbook. This is why I don't think it is usually a good idea to let kids have "fun" days. At our kid's school, if they miss more than the acceptable number and do not have a written excuse (medical) for each one, they can be retained.
If she is sick, and has been sick that much, then she should have had notes for all of them and they should have been "excused". I may not understand it all exactly right, but I think that "excused" is the key. If they are unexcused, the only consequence is that the teachers are not required to allow them to make up any missed work, UNLESS they go over the number allowed. If they are excused, the kids are allowed to make up missed work within a set amount of time (usually related to the number of days missed) and if they are excused, then I'm not sure about the limit application.
Oh.. normal for my kids?
Maybe 2 or 3, when they are actually sick. My son missed an entire week in the 6th grade due to pneumonia. That was rough, catching the work up after. My daughter had perfect attendance last year. The year before, she only missed perfect attendance b/c she fell on a holiday and broke a front tooth in half (a permanent tooth) and we had to take her to the dentist the next day (school day) to get dental work done. She almost cried because up until then (in January) she had perfect attendance. I think she ended up missing one other day that school year.