In the under 2 set Time Outs are really not that effective IMO and in my area they are not allowed for kids under 2 anyway.

My 18month old is getting more spirited as well. I think part of it is learning boundaries etc.

When she does something inappropriate I make a big deal of the kid/dog/cat that she did it to "oh sweetie are you ok?" etc lots of hugs while not rewarding my 18m/o with attention etc.