Got vesna c0r1, should I use my remaing cost this banners?

I don't have vodya. I have C6 Diona and r1 gacha bow rn, Odette C2 (shared with sandrone team), faruzan C6 (prob on R5 fav), CMC ofc, C2 Nicole (shared with everyone). My goal is to clear dire when I can. Do I need vodya? Or maybe C1? How good is Diona with gacha bow?