For good physical and menatl health, a child this age should be receiving eleven hours of sleep each night, or as close to that as possible. The situation you describe is definitely not reasonable. It is highly unusual for a child so young to fall asleep in
schoolPreschooler development
Preschooler test
Preschooler test or procedure preparation
School age child development
School age test or procedure preparation
School-age children development. When that occurs, it is a sure sign of illness or lack of adequate sleep. Now, you are not the parent, and ultimately the situation will not be decided by you. But, in a calm, supportive way, try to advocate for a better sleep schedule for this little girl. You may be able to enlist the help of one of the teachers as well. Many parents are well intentioned, but they have limited knowledge iof how much sleep children require. Many children in this country get to bed too late, and would do better in school, with friends and in the family if they were receiving adequate sleep.