英语:为什么这里要加have?A wealthy matron is so proud of a valuable an

英语:为什么这里要加have?
A wealthy matron is so proud of a valuable antique vase that she decides to have her bedroompainted the same color as the vase.
请问decides to have her bedroom painted 为什么加Have?
如果用 decides to painted badroom可以吗?如果可以 后面的the same color as the vase是不是可以直接加还是还需要修改下?