It's been a long time... - הריון ולידה

I apologize for writing in English.
So it has been a 1.5 years since the last time I have been here. Many things happened to me and Shiraz during this time. The reason why I decided to quit this forum was that I did not feel belong anymore. To those of you who remember us, I got divorced really fast and sudden and I and Shiraz moved to Canada. So I was divorced, living with my parents and not working; therefore, I did not feel belong anymore. But I really missed this forum and I need your help. I studied for 1.5 years and about a month ago I graduated. I missed 1.5 years of parenting and I feel so bad that I spent so much time studying instead of being with my daughter. My parents took care of her most of the day until I returned from the college. Since we left Israel she was out of day care. So now she is almost 4 and she is going through the worst behavior. She does not listen to me; she screams a lot, she does not want to sit during the story time. She is sleeping with me during the nap and night time sleep. I am so lost and frustrated that I do know what to do and where to start. I try to spend with Shiraz as much time as I can, I am taking her to a literature center which is a free center for kids with their parents so she can learn to play with other kids and to get used to the environment because she is going to a junior kindergarten in September. If she will continue behaving the way she is, she will not be able to start the junior kindergarten. I know here are so many experienced Moms who may give me a good advice, so PLEASE I need all the help in the world.