She is 3. She is a "Big" sister. She wants to do it all NOW! then she doesn't.. Think of it as a nice long year of PMS.
Totally normal, but maddening.
Children this age are absorbing and learning all of the time. Their minds are on over drive. They do not want to stop, unless it in their idea. They also want to do it themselves, until all of a sudden they want you to do it.
The best way to help 3 year old is to let them know what a big helper she is.
Let her know you like when she puts her own shoes on.
You like that she remembered to brush her own teeth.
This will show you are seeing her. You do not have to go overboard, but it is that little pat on the head that lets her know she is not being overshadowed by the baby.
She also need to be told what to expect for each day. A good schedule, will make her feel secure. At the beginning of the day, let her know how it is all going to go down that day. Today after breakfast, you can play for 30 minutes, and then I will need your help getting ready to go to the grocery store. Then give her the 5 more minutes of play, then "you need to put away your toys, thank you. "
"Help me pack baby sisters bag."
" How many diapers are in there?"
" Did you pick a snack and drink to take to the store?"
"Remember, we do not buy snacks and drinks while shopping."
" Please help me find my sunglasses."
Here are some choices about clothing and shoes. Only pick 1 per situation.
"Do you want to wear the sandals or the tennis shoes?"
"Do you want help, Or can you do that yourself?"
"Wow, you got ready all by yourself. Thank you."
Throwing tantrums. ignore them, EVERY TIME. Step over her and ignore her. If she follows you, walk away and even go into your own room and close the door. Tell her that "mom is in time out".
Once she calms down, speak with her about how you do not like when she throws fits. It is easier to talk then to throw a fit.
If you see one escalating, look at her with a blank face and ask, "Do you need a hug?" "Do you need some quiet time?" "Do you need to go outside and run around for a few minutes?"
This will help her recognize that she is about to lose control, but there are some options.