Kobeni is an extremely shy young woman, we can see throughout the work how easily she is manipulated by her own feelings when faced with a situation that makes her nervous, like what happened at the Morino hotel, where she almost killed Denji for being desperate at the moment.  Obviously, she apologizes to the guy later on, but her appearances in Chainsaw Man are pretty short and the character hasn't received much development.  Her shyness prevents her from even showing her personality.