It's too complicated a problem for her so solve.too 可不可以换成so为什么

It's too complicated a problem for her so solve.too 可不可以换成so
为什么

不可以It's too complicated a problem for her TO solve
固定句型
要说的换成so 得改成从句
It's so complicated a problem that she can't solve it.

It's too complicated a problem for her to solve.