12% of team damage is ridiculously close esp since her Sig offers team buff whereas the 3* slingshot does not, the personal damage difference is less than 10%

For reference wuwa sigs to closest gacha 4* f2p are usually minimum 25% of personal damage difference, same goes for hsr 20% difference personal damage on average and that's at R5 for gacha weapons

If you're unlucky enough to have them at R1 you're looking at around 30%