This charbray heifer has been threatening to calve for the last 24 hours, restless, lying on her side intermittently, all bagged up. When there was no calf this morning, I put an arm in but she was very tight, not dilated at all, and quite dry. Her efforts have escalated during the day, she is lying on her side pushing, quite desperate. I put my arm in again, she is still not dilated much. I could not feel any sign of a calf, there is nothing in her pelvic area. I'm experienced with calving heifers, not a newbie. Has anyone struck this before? She's been trying to calve for so long now but is still tight around her back end, just losing a small amount of mucus.