You can guess it by considering few things. Women are considered the most expressive of the species. So, it is obvious that she tells you that she loves you. If her parents treat you warmly it is a clear indication of heat between you and her. Women’s emotions are clearly evident from their faces. If her eyes sparkle and her face glows when you enter the room. She waits for you if you late or stands at the door, while saying good bye, till your tail lights disappear. She manages to call you in the middle of a hectic day, just to hear your voice and say hello to you. If she cooks your favorite meals and caters to your palate, actually she is expressing in her own way that she loves you. She seems to be very contented around you. One of her best friends may whisper to you that how she always talks about you and you are the best thing ever happened to her. She tries to look beautiful and charming for you and want you to compliment her. She shares her troubles with you and feels lighter.