First of all, she was interested in you and probably wanted to fukk you. A girl doesn't place herself alone in your room and on your bed if she doesn't want that.
Second, locking the door was a minor slip up. You weren't quite there yet. You should have made a move first, gotten things going, and then worried about privacy.
Third, her game kind of sucks but it's a variation of "high interest" that a lot of guys here miss or dismiss as low interest. "Did you just lock the door" was not a rejection. It was an IOI. Her talking about her Tinder boy was not a great move on her part - bad form. But she was probably trying to communicate to you that she was DTF. This is a tough signal to read because our egos can get in the way as soon as another man enters the conversation. What can I say, women are just stupid, and they probably lose a lot of lays for things like this.
This was a big IOI precursor that should have had you feeling invincible. When a girl goes out of her way to qualify herself, she's into you. Of course, a lot can change between then and the night of the party, but it sounds like she had the expressed interest of coming to see you to possibly fukk you. Obviously this was later backed up by her lying on your bed, but I just wanted to point it out.
This was your inner game disrupting itself. I have had this problem in the past too, when making a move (or not) on girls within a tight social group. I believe we still have a fear of being ostracized embedded in us from days of yore. It doesn't serve us well in situations like this though. Think about it for a minute. What's the worst that happens: She tells her friends "BarfyMan tried to kiss me." So what? I can understand the door-locking thing being construed as creepy, so you have to think on your feet. "Oh, just a habit, girls are always trying to get in here" - with a smile on your face, and unlock it. Or, "as long as you don't mind another girl walking in on us." This stuff is hard to come up with in the moment until you have achieved a consistent state of value/abundance. Basically, whatever you do, let her be the creepy/weird/dorky one - always frame it as such.
Finally, she's in your bed asleep...not sure how drunk she was but you were within your rights to at least sleep in your bed. If you were both of sound mind maybe something would have happened. I had a party a few weeks ago, and two girls fell asleep in my bed. I joined them later, wasn't going to do anything untoward, but to sleep...it's my bed, dammit.
I will add that this is an example of how being "friend zoned" or whatever is never permanent, and IOIs are not always so obvious. I think you still have a chance with this girl, as long as you stay cool and be the high value guy throwing the party, inviting her over, etc.