from what I understand,
Holly and mom see each other before mom goes to work, talk about BF going hunting on cousins property.
BF, whilst hunting is confronted by cousins family about why he is on private property, BF tells cousins(or extended family) that he is Holly's BF and that he has an open invite to hunt on the property. he calls Holly to let her know that he ran into her extended family, and informs her of the convo. I might be remembering incorrectly, but i believe Karen also had a convo with someone that morning about BF's hunting on private property. So to Karen and presumably Holly, Holly's BF was Confirmed to be hunting on some family property. Therefor Karen knew for certain in her mind, that the man Holly was seen with in her driveway that morning was NOT her BF. (sorry I cant remember everyones NAMES in the case yet without popping all over the place, so i just used BF for Boyfriend) im sure ill remmeber some day
Looks like the court room is filling back up again .