When DD was about that age we did time out b/c I couldn't reason with her (she was too young/immature to understand) only for a max of 2 mins. I used to put her next to our dining table with the oven timer on and I'd be around where she could see me. When the timer went off I'd explain to her what the negative behaviour was then we'd have a cuddle. She again was too young to get the whole apology thing. As she got older time out or time in didn't work, so now I try to tell reason with her to an extent. It's really tough and some kids won't respond to time out or reasoning etc... you really need to work out what your DD will respond to b/c each child is different.