failing to listen/poor practice. the child is already scared, forcing it will only make her more scared.
the expectation to socialize is not inappropriate, but forcing it is. the child may be capable, but needs to take gradual steps.
I had a child I worked with like that (at her home). Mom couldn't take her anywhere new without a melt down. Mom wanted child to visit the library (which mom really liked to do herself as a child), visit an Uncle, and go other places.
Day 1. We went to the library with favorite toys and played outside.
Day 2 (working with parent). I went in the library (with the toys) and right back out. When child showed some interest, I waited inside for her to follow me. (just inside the door)
Day 3. We went all the way in, she noticed the computers, then didn't want to leave.
next we worked on Uncles...similar process
next we went to a Childrens museum...she walked right in..no problem....
in this case, the child can be allowed to watch from the outside the 1st day, encouraged to sit just inside the door (with door open and adult next to her)...have a desired item in her line of sight.....
if the child is familiar with picture schedules, it can be added to that (ie class visit with a specific activity such has read 1 book, then the next activity in her regular class)
if she is familiar with timers, you can show her 3 minutes visit, then all done for that day....