Meredith would have needed to both depart and arrive with the lamp set in such a way that it would be possible to do so without the lamp tipping over in that case. Very possible.
I have wondered if Rudi Guede grabbed the lamp to look for Meredith's keys in the past. However, Dan O. has pointed out that the overhead light worked so I don't see a reason to do that.
The lamp remains a mystery.
Or the lamp could have gotten knocked off her desk during the struggle. Thats a more likely scenario then Knox/Sollecito forgot the lamp behind the door and was able to squeeze out of the door without noticing and knocking over the lamp and forgetting to plug it in. Everyone assumes that the lamp was brought in Meredith's room after she arrived home that night. Yet there is the chance that Knox only noticed her lamp missing from her room because of the break in. Meredith could have very easily borrowed it earlier in the day.
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