As a blunt person who likes to know where she stands, she likes to lay the cards on the table and deal with things as they are. As such, she may be trying to read the clues and realize that yes, she feels herself to be in love with Brad, he isn't reciprocating her feelings as strongly as he was in Catalina. She may be realizing something is off and when she is adding 2 + 2 she is getting 6.
Bevin said that she knew all day that Andy wasn't going to pick her. If you noticed, she was crying on the way to the FRC and was a basket case. She was already looking at Andy like "Why are you breaking my heart?" before he said anything. Would also make sense why F2 Tara was sick on the way to the FRC--because she had the pit of the stomach feeling that it was wrong.