For what it's worth, here's my two (female) cents:
I think she really likes you. She wouldn't be hedging so much and testing the waters if how YOU feel about HER wasn't important to her.
I also think she's very confused about what she wants.
You are, among other things, her safety net.
As for the summer and what should you do about all this, I say go for it. Look at it this way, if you don't, both of you will spend the summer wondering, being edgy, looking for that "definitive" clue that you won't be rejected.
Is that really any better than hearing definitively that she only wants you as a friend? (and I don't think she does)
And here's what I think she wants YOU to do: Show some confidence. Go crazy and look deep into her eyes and tell her (rehearse it if you have to) that you're wild about her--her beautiful eyes, her gorgeous smile. Tell her how your stomach does somersaults when she comes into the room. Tell her that you don't give a damn about anything else but making the most of these few months you have together.
You want to confront this. Your posts are pretty clear. I think you have the signals from her. What are you waiting for?