Lucy mid diffs
There are many options...
Lucy can now use star dress and have at least one spirit summoned at the same time. With one of her strongest spirits, Loke or Capricorn, she could do it...
Other option is casting 2 or 3 spirits to gain time, and cast Urano Metria to finish her off in one shot... However, It´s debatable if she can cast her celestial attack while having 3 spirits summoned, we don't know for sure the extent of powers she has now, after time skip...
CSK is always the safe way to end this fast and unharmed, but at a very high price...