"I think she knows he lost his memory. During the fight she says "I can remind you of me 3 times" & "there's 4 times left". And she seems to be letting him attack her when he flies toward her with his sword then he can't do it & spins off. So it seems clear to me she knows he lost his memory & she's trying to trigger his memory & avoid fighting him. He also asks her during the fight "just who are you?". Different clips show her answering "I'm your niangzi (wife)" and "I'm your qianer (Money)". I wouldn't be surprised if in the full scene she says Yue Xia too TT. It seems like he sends the star back to her after remembering & she understands saying something like "I knew you wouldn't forget me (for good)"."
UPDATE: As I suspected, in a new clip she says "YQ I'm your niangzi (wife), your qianer (Money), your Yue Xia" TT.
https://twitter.com/xirein/status/1633433290337320960?t=U4W4hK14RxMNLFbvV_CCng&s=19
Now that it's clearer, I think the thing about reminding him of her 3, 4 times is a reference to the shards. More like "if I could get you to think of / remember / fall for me...3 times...then a 4th time is possible" so she has hope though she still fights him.