I work in a preschool. Our youngest kids are 3. If we see someone take something, we'll see if Child 1 reacts (asks for toy back) and how Child 2 responds (gives toy back/doesn't). If Child 2 refuses or walks off, we'll correct them by asking if they took that toy, did they hear Child 1, etc, apologize. Sometimes they work it out, sometimes Child 1 just walks away, approaches teacher, etc. They're just learning to socialize and interact with peers. They need the oppurtunity to try working problems out... BUT we also do not allow children to just take things from others. Some kids habitually take things and we quickly see which children we need to keep an eye on. They also get more comfortable the more they're at the center and some become more agressive. We do our best to keep our eyes everywhere and correct as much as possible.
If a parent at the center I work at had your concern, we would not mind being asked about it.
Also, her referring to him as her "friend"... they are too young to really understand what a friend is. She may just be telling you what a teacher has said to her, something like "We are all friends at school." or "We do not treat our friends that way." "Let's help our friends clean up" etc.
