Answer:
You should tell her that her study didn't involve naturalistic observation because the play behavior was not conducted naturally.
Step-by-step explanation:
To understand this answer we most recall the concept of naturalistic observation. It is a technique employed by psychologists and social sciences researchers to watch and by watch, I do not mean see I mean watch, which envolves also hearing and analyzing. That helps them capture the nature of a certain group's behavior in their natural environment. Thus, that student's observation wasn't naturally done. Because she controlled the children she was observing and that is why our answer is correct.