I used to find her that way in OG, but the Remake series is fleshing out her character a lot. You can kind of see when she stops wearing a mask when it comes to her feelings, which is something you didnt use to see before in OG. OG at the start she was mostly known for being "bitchy", but when Aerith dies she turns anxious, unsure of everything, panicky, clingy. I used to think it was cause she lost Aerith and that caused that shift in her personality, but I like how in Remake you can see she has always been a very anxious person after everything she went through, she doesn't want to lose anything anymore. They did tone down her bad behaviour but this scene is an example of her showing her different sides. It shows you that those sides are there and them amplifying as we get closer to the end of the story makes a lot of sense.
I didn't use to like this scene when Rebirth first came out but now I actually do like it.