With the footage we have available to us what does Rey emotionally have to contend with? Why would she reach such a point of anger to strike down Kylo the way she did? What does is the reason she is so upset at Kylo during the Skype fight?
I think her anger towards Kylo comes from two places: 1) He is her primary obstacle between her and the wayfinder, which she needs in order to kill Palpatine and save her friends. 2) Kylo keeps sewing doubt in her own moral fortitude. He manifests her insecurities. So if she gets rid of him, she can erase those insecurities in a roundabout way.
That works for me, personally. Essentially at the time of that battle, she basically has tunnel vision and quite frankly, you SEE that with her in action and words.
Question: What about the ship? AKA the ORCHI/PARENTS Ship? That is the one hiccup I can see if one was to pretty much remove the whole parent thing in this movie.