Pretty sure Lucy'd still have her magic; as long as the Tenrou Tree (the main source of her magic) is still standing back in her universe. Perhaps I could make her magic much more limited due to her being in a different area, and very much far from Fiore and Tenrou Island. 

Let's say her maximum amount of magic would be 175, and every time she uses a gold key, she would use about 30 of that amount, and every time she uses a silver key, she would use 5 of that amount since silver keys don't really use as much magic power.

[b]Example:[/b] If she were open multiple gates such as two of her golden keys and keep them open for 30 minutes, every minute of keeping the gate open she can lose 1 of her magic ability. (2 gates= 60 magic, 30 minutes= 30 magic; 175-90= 85 magic left) And so on and so forth.

In the manga, I've seen Lucy be able to open about 5 to 6 golden gates before she lost most of her magic. So I kinda cut her ability of opening golden gates to a half. Suggestions if you feel the need to?? ^^"