Hello, are you referring to the percentage of time she is included at school? That is, the total number of hours she spends in the regular classroom as a percentage of a typical school day. This number will be at the end of your child's IEP, under and should be calculated along with the hours that comprise a typical school day. The calculation should also be there with a result such as, "80% of the day (inside 80% or more of day)."
This can give you a good indication of how much your child is included in a typical classroom. You should weigh this against how your child is managing her time at school, along with what she is doing during those hours. (Keep in mind that just because she's in the room, she might not necessarily be included). Make sure these questions are answered before complaining to the school about the amount of inclusion time. If you feel she is struggling because she is being included too much or too little, you may want to call a meeting, but make sure you have your facts before doing so.