Make a long story short, creeping on facebook and there is this 10/10 girl who looks amazing.

I've messaged her and I've had her constantly laughing and giggling, all signs of progression (I think?), but she doesn't trust me enough to even accept a friend request. She is using a lame excuse to not add me despite having around 800 friends.

I would really like to get to know her better and I want her to open up, but not sure how. Even if I say ]
"(information about me) now you?" she just goes silent.

Any pros out there experience this? I know I should probably move on but there may be a way to salvage the situation.