Children do know when a teacher does not like them and it is awful. I have seen this in my private school and think the teachers should be fired.
This is a pretty silly post. Firing someone because a kid doesn't think they are as "liked" as they want to be? As long as the teacher is professional, there is nothing to worry about.
OP, I think the best you can do is use this as a teachable moment and discuss with your child what they wish they teacher would do and talk about understanding how difficult it may be to treat every child the same (call on them enough, etc). Also, use this as an opener to a long conversation about other people's approval and doing your best and learning to be proud of what you do even if the teacher doesn't point it out as special at the time.
There are several good conversations that come from this that can help your DD grow into a confident person and student.