TTC#2.. Child #1 HELP PLEASE!

My only daughter that is 4yrs old has only child syndrome ever so bad!! Its very discouraging when I have to tell her there's not a baby in my belly every month. So I've stopped talking about it all to my spouse when she's around.

It all started after my miscarriage, My daughter cried for almost two weeks about it. She wants a baby sister so bad. She pled with me to have one, she's demanded I make one, And even told random ppl I have a baby in my belly (even tho I dont).

I don't know how to help her. I want to have a second child as bad as she wants a sister but we all know everything that is ment to be happens in good time.

But not only is it the having of a second child.. my daughter specially wants a sister. And I'm not sure how to get her to understand I can't choose what sex the baby would be if I even got pregnant!

Someone with more experience please help!! Any advice is better then continuing on this same destructive path!!