Wow that would feel like she was challenging my frame big time. You can either bring her into your reality where you two are on the verge of being back together or slip away into her reality of LJBF I would personally move on, give it a shot tho and good luck! I now feel like every single girl is replaceable in a single day with a strong skillset.
Some advice if you go for it, saying "I'm trying so hard to kiss you right now" would not have done it. Your meeting resistance not because of your approach on the kiss but because something else that happened at an earlier step which wasn't done right. Regame her from A1 and go for the kiss close at the end. You will need social proof/strong eye contact/early
kino/ good body language. Come from a position of not needing/wanting anything.
on the kiss close be whispering something in her ear then k-close its less time for her to react or reject.