Does my daughter(18m) have a problem?

Fiona

So I had a playdate today. There were 2.5 years d,2 years old, 20months old and 18 months old(my daughter)

Kids were playing together nicely at playarea but my daughter did not play with them. Instead she went to the area she wants to go and she showed no interest into her friends.

I’m sad and worried. I thought she was going to be more friendly by now.

At home, she likes playing with me and my husband but I started wondering if she has a problem in social setting???