She probably saw Isaac the creepy ghostkid wandering around, and then he would have been her butler for a while. For the time she was in the castle, he would have made her comfort tea and listened to whatever she needed to get off her chest. Talk to your butlersss.

Garrett arrived at the Hearts about the same time as her, and Wren is her Ace. So. Probably know each other? Wren's a force to be reckoned with but can be gentle, and Garrett is... just Garrett. He is everyone's friend.