I am not sure if I am expecting too much of my DD or if this is a symptom of a bigger issue. She has been very sassy/running off at the mouth with cruel comments as of late and can't seem to stop torturing her brother. I have her go to her room when she does this but she keeps telling me, "I just couldn't help it Mom! I couldn't stop!" At first I thought her behavior was normal for this age and that she didn't care to stop but now I am starting to wonder. She is 4.5 years old.

I am looking for experience, suggestions, insight and so forth. Thanks in advance for any help!