We recently introduced a few weaned heifers to our herd and one of the new heifers won't join the herd. She'll get sort of close at times and won't run off if the herd comes around her but she won't follow them. It's been about 10 days. I've never had one take that long to adjust & "join the crowd" but we haven't brought in a lot of new cows, or maybe I've just forgotten how long it's taken in the past. She seems healthy, ears not droopy, we've seen her graze. Is it common to take that long? Is there a chance she's still missing her mama or still adjusting to being somewhere new?