i am no expert on this , but i suspect it might become terribly complicated , especially if she is talented and starts generating capital and dividend gains
ALSO some shares ( like QAN , for example , have regulations on how much of the company can be controlled by foreign nationals , so her trading via your account might create some minefields )
i would probably go looking for a couple of experts on this area ( say a full-service stock-broker and a person very skilled in tax law and accounting )
by the way
welcome to ASF