She’s young, plays games and has no interest in a romance with you (possibly with anyone else). Find yourself someone else who might be interested. Don’t obsess on her and her motivations for her behavior. Either she’s flighty, fickle or insincere or all three. If I was you, I’d find some greener pastures.
There’s little relevance to your situation whether or not she has blocked others on social media - only that she has blocked you. If exams are over and you’re still being blocked, she’s not interested for whatever reason she decided. Look elsewhere because she’s just toying with you. The fact that you’re wanting to confess your love to someone after a very short period of time without really knowing her is a red flag warning. You’ll soon get hurt because of her indifference.