After you send the file to her, call up the task manager on her computer (because sometimes the keyboard can't be used remotely, and alt+ctrl+del can't call it up directly. You can right-click in the blank space of the taskbar below and select Task Manager to enter, or you can enter taskmgr in Start-Run and click OK to enter).

After entering the task manager, there will definitely be a task in the application bar that belongs to your QQ chat window with her. Double-click it to bring up the window where you chat with her.

As for the reasons for this situation, there are generally two kinds. One is that the chat window is not hidden at all, just because she and your taskbar are automatically hidden. When you don't view her computer in full screen, you move the mouse down and your taskbar will come out first, so you can't see her taskbar, so you can't see the chat box. The second one should be that she changed the QQ settings and hid it when it was minimized.

Either way, it can be adjusted by the above method.

LZ said no is impossible. I often use QQ to solve problems for others remotely. Sometimes this often happens when the network delay is long. When you see the other person's desktop sending a message to the other party, you may see my message in the other party's chat box every half minute, or the other party's computer doesn't respond (in fact, the response speed is super slow). In this case, I always ask for another time to come remotely because of QQ.

So, unless you do this every time, next time. If you do this every time, you can go to the system service first to see if there are two services related to remote desktop running (there are two services related to remote desktop in the system service, I never remember the specific name, but you can see it when you go in and read the description). Do you think this change will help your operation?