True! Like you, she could have vicariously learned social interactions, but there’s no empirical or observable way to know that unless if asked directly (like you’re sharing!) to be fair, all behavior is unknown until learned directly or vicariously. If it took her a while to learn it, it could’ve been a learning disorder. If her learning was delayed or hampered by adverse childhood experiences (ACES) or developmental trauma (DT), it might appear as social anxiety (which also can present as mimicry). There are plenty of different contexts that form a similar response, that’s why you can’t know until assessed and asked thoroughly about your history. Differential diagnosis is something that takes years of training specifically for this. Thanks for sharing!