1)Often checks up on you. Checking up on you all the time (phone calls, text messages, emails, surprise visits) means only one thing you're always on her mind. Why else would she bother saying hi? It's not just for the hell of it, believe me. There's just this sudden need to get in touch with someone you're attracted to.
2)Wants to hang-out all the time. She asks you what you're doing tonight, what your plans for the weekend are and how possible it is for the both of you to hangout at her place in about 15 minutes. She's excited being around you and when you are, it lifts her spirits and gets her in a better mood.
3)In a happier mood when you're around. She starts to get all excited and even jumpy after you just arrived and she loves talking to you .you can both go for hours and hours and she can even laugh out loud no matter how corny your jokes are. She wants you and you lone. Forget the jokes. She's also getting all flirty and will tend to send you mixed signals as well.