What to do?

[nyiszi12]

I don't even know where to start?  
My daughter just turned 4 in July.  This is her second year in preschool, and she loves it.  She loves to play with her friends.  I think she learnes a lot in school but she doesn't talk about it much.  
I'm from Hungary and  I'm teaching her both English and Hungarian.  I think she is a little behind with her language but I think she will pick it up eventually. My biggest problem with her is her not listening to me.  I would tell her not to chase the dog at least 50 times a day and 5 minutes later she does it again.
Or today we went to see her friends.  In the car before we walked in I told her that her little brother will be tired in a couple of hours and when I say it's time to go home then she has to be a big girl and say goodbye and come home.  She didn't!  I even gave her 5 minutes to get ready and say bye to her friends but she came out crying and mad and throwing a fit about that she wants to stay.  
She constantly saying no to us and seems like when I disipline her she's just repeating what I say to make sure.  Today I told her she can't go outside tomorrow with her friends to play because she was not a good girl and set down and told her why and it's making mommy very sad that she does not listen at all.  Nothing seems to work as far as disiplening her.  

The other thing that's bothering me, that she can't just stay in one place and do one thing at a time. When her friends are here playing with her, I've noticed that she asks them 3 things to play with in 1 minute. She can't just sit down and play with her doll house.  She would sit down for 2 minutes and jumps on the other. Is this normal?  She is just none stop!  

I don't know what to do with her, and I'm scared to travel with her.  We are traveling back to Hungary next week and I'm very scared that she will not sit for long.  
Anyway.  Any help would be great!

Thanks,

nyiszi12