Looking for pen pals from Spanish speaking countries

Hi
My daughter is 3.5 years old and I’ll be writing on behalf of her for the time being. Looking for pen pals for her to write letters , postcards , exchange used books and share festive seasons .
We can write back and send out in traditional Chinese materials. Need by normal posts so she can touch and feel the letters , I think that works better than emails .
She has been learning Spanish for some time but not much exposure to Spanish in hong kong. Pls pm me if you are interested . Thanks