that's This is ridiculous!

I'm sooo upset since because my mother started wondering wants to come to England to see me!
Guess what!She already booked her flight ticket to England. (or she already bought her ticket.  No need to say flight ticket) Also I booked some coach tours and applied for my holiday to my college for 1 week!

Why she's wondering is that because of her mother, Her mother means my grandmother.
When my mother talked about her trip in England to her,she, My grandmother wasn't positive that she wanted to let her go there alone since she is too worried about her.  She is it's over protective.
But I'm going to pick her up at the airport and also take her to the airport when she leaves here.
So I think what is the problem is!? She won't be alone during her trip in England since she will stay with me all the time.
And what about me?!!?!? I came here alone. I'm living here alone. I do everything by myself.
I talked about it to my European friend and he said Asians tend to be overprotective for of their children...

I'm gonna talk about it with my mother tomorrow anyway.

*I'm upset at the moment but I'd be happy if there is someone who could correct my note.
Thank you...

I reread your entry several times. Are you trying to say that your mother is having second thoughts about coming to see you in England? If so, here are my suggestions:

_____________

It's ridiculous!    I would use "It's" over "That's"; "That" suggests you're responding to someone else. 

I'm sooo upset since my mother started wondering about coming to England to see me!

When you use the word "wonder" you want to follow it up with what you're wondering about. You might want to choose a better word as well. "Reconsider(ing) (her decision to come to England...)" or "Questioning(v.) (her decision to come to England...)" might be better alternatives. A common term is also "expressing doubt (about coming...)"

Guess what! She already booked her flight ticket to England. Also, I booked some coach tours and applied for my holiday to my college for 1 week!

The reason she's wondering is that because of her mother. By her mother, I means my grandmother.

When my mother talked about her trip in England to her, she,my grandmother wasn't positive about to letting her go there alone since she is was too worried about her. It's too overprotective.

But I'm going to pick her up at the airport and also take her back to the airport when she leaves here England.

I would be specific because the noun in question (England) hasn't been stated yet. 

So I think, "What is the problem!?" She won't be alone during her trip in England since she will stay with me all the time.
And what about me?!!?!? I came here alone. I'm living here alone. I do everything by myself.
I talked about it to my European friend and he said Asians tend to be overprotect for of their children...

I'm gonna talk about it with my mother tomorrow anyways.