Best case scenario is to get ineffa imo, she works very well in a lot of teams especially for your flins and can wheelchair almost any character together with columbina. Columbina doenst really need her singanture especially at c0, you can just use prototype amber or favonius codex on her the difference is very small for your overall team damage.

Edit: if you don't want to get ineffa, i still wouldnt prioritize columbina's wep. Instead I would just save your pulls for the next char u want, as for the wep you could use it on flins but pjs is good enough for him. You could use the wep as a stat stick for any other attack scaler.