Surprised Frost let Clarice pull her head down to kissing height. Was expecting the latter to have to hop up for a quick peck instead.
I’m guessing Clarice is stronger than she looks
I think it wasn't that Clarice was stronger but that Frost is weaker to her. In fact, I think that is what infuriates and terrifies her. She has a deep-seated unfulfilled need to be close to another person (I mean, every human does), but her past experiences have taught her that doing so only causes pain to her, specifically, in the long run. Frost is weak to Clarice's extraverted go-getter attitude, which makes her very vulnerable emotionally, which terrifies and causes her to lash out at Clarice in anger.
Never in my life have I've seen such a "fuck it, we ball" approach to romance before. Clarice really saw the Black knight threatening her life and decided to respond by going all in on the "Imma seduce and make this bitch happy of it's the last thing I do in my life" grindset.
Most useful lesbian of the decade.