Kim's fears about Matt and the way she handles her crush show that she is indeed still very young, woman's body or not. However, it's also worth keeping in mind that given Kim's extremely busy schedule, she doesn't necessarily have time to dedicate herself to figuring out how to actually foster a healthy romantic relationship. Similarly, Kim's fear that voicing her feelings for Matt would jeopardize her academic progress suggests that she's beginning to see that he's very much on the opposite side of the work/education conflict, and that could pose problems for them both.