I found it interesting that the former FBI agent read Aniah's body language/facial expression inside Chevron as "not normal," in the sense of him perceiving she was deep in thought/preoccupied. I think he was inferring that it looked like something was troubling her. I've viewed that Chevron clip several times, and it always goes too fast - but I've always gotten the feeling that she was tired/very low-key. It's one of the reasons I didn't sense she was gung-ho to meet some new "Eric" person.
I know that video is just a small snippet to draw any conclusions from, but it got me thinking...Did she receive a call or message/read a SM post while at the funeral that upset her/put her in an upset or serious frame of mind? Was something deeply troubling her -- an issue she knew she needed to resolve with someone? This would be simpatico with what her stepfather (I believe it was him) said about her seeming so "tired" at the funeral -- he was concerned enough that he wanted her brother to drive them back. Being down or drained can look like simply "tired."
Also, when arriving home, was she meeting up with a person known to her, to resolve whatever issue was troubling her -- but she wanted to keep it to herself? Did she type the Eric message, but it sounds really off because she really had an entirely different situation she was attending to that evening?