Can you give me a hand with my site ? My niece did it good but I need a little fix

We have heard that sentence a couple of times and our answer is the same: NO WAY. Websites are like buildings, if you don´t do with a strong base, and of course, with the apropriate structure, you better run from it because sooner or later it will fail. Build it again from cero is always the better and chepaer idea.