Girl on girl: Is it more likely that she's actually straight, or in denial? Please share your thoughts?

[Jennifer]

I think there is a mutual attraction. I don't know how she identifies herself and she may not really identify with anything specifically because she's not built that way, or it's just safer to play things completely straight (except she's not really.)
I think you are getting a lot of mixed messages. You are asking some really good questions. Of course, you should ask her clearly and directly, but you should use your own judgement too.
If you're confused, you can choose to make things clear. If you decide she is your friend (only), stop kissing and making out. Friends don't kiss and make out and don't let her go there. If she's fun to play with, she's fun to play with. That's all it means.
In my opinion, you're not dating, you're playing around. It doesn't matter how she identifies. You are physical playmates. ONLY. Will someone who wants to date you do it if they know you have a playmate who pops into town every now and then? If you begin to date someone seriously and that means no play time, will she understand or get upset? If you're not clear about this, you should make some decisions in your own mind and then discuss it with her.
You go to Uni far apart? You're not in a very good situation to have a monogamous dating relationship. From what I've read, you haven't been give any kind of commitment from her about your relationship, so I don't think you have anything to rely on. Whether she identifies as lesbian or not, she's not acting like someone who is interested in you any more than when you're available and horny. It's hard to meet a good girl. It's harder to meet a good girl when your lesbi/friend from out of town keeps shoving her tongue down your throat.
One of my favorite thing about dating girls is that girls who are friends and girlfriends look the same to most people who don't know any better so we can get away with a lot more cuddle time than a girl and a guy. Straight girls smooch on each other and pose together in pictures all the time. Many people who look at her FB photo will not realize that you spend so much physical time together just based on the picture. I'm not sure that it means the same thing to her that it does to her. If it is meaningful to her, she needs to tell you she likes YOU and not just your lips. If she's not paying attention to YOU she could be kissing on anyone and you don't matter at all.
Save yourself. Draw the line and put your attention to finding someone who isn't so confused. She's got to work some things out with herself. You need to cut her loose in my opinion.