Diana will never win against Lapis because she offers the single thing that Natori values the most...job satisfaction
Please tell me this is sarcasm... Because no matter how much Natori likes to mistake her feelings for that, we as the readers really should know better.
"What is this quaking excitement in my body? Why does my heart thunderously pound? OH I KNOW! IT MUST BE THE OVERWHELMING SATISFACTION OF A JOB WELL DONE!
I will say though that for someone who is severely undervalued and shafted the idea of an employer both recognizing and praising your hard work is some real potent stuff. Combine that with the fact that Lapis can also make Natori's heart pound like a war drum and that is a powerful combination.