D.W.
It's not realistic at all to expect a 1 1/2 year old to know or care that she's in trouble. That's why you only set the timer for 1 minute per year of age. They just don't have the memory yet. And you can't expect her to be a perfect angel. It's just not realistic. She's a child who will grow and change constantly. She will go thru many developmental milestones and with lots of behavior changes. They won't all be this drastic but she's not a robot and you can't expect perfect behavior. Consistent redirection is what is going to get things to start to click for her. This is a big adjustment for her and it will take some time. She's not used to being with that many kids in that type of situation. Perhaps too, if you are able to join a mom's group where she can attend play groups with other kids her age it will help reinforce positive behavior. A lot of mom's groups try to plan activities on the weekends for working parents.