What should I do??

I got this fiddle last year, it was full from top to bottom , but leaves were brown. A lot of them fell off, I also found out it had spider mites. Fast forward , spider mites are gone , I've found the perfect spot for her and she has new growth! The leaves with brown on them are the last ones from last year. My question is do you think she will fill out in the empty space over time or should I propagate the new growth and try from there?