We have had similar issues over the years. A pull can be extremely taxing on the heifer and time will tell you what you get. You are doing all the right things with getting her water and food but don't try to get her to do something she doesn't want to do. If she won't stand don't make her. If she stands but lays back down let her. Good idea to do what you did with the bales to give her some support. A heifer can have a uterine prolapse up to a week after a tough calving, although it usually happens within a couple of days. Check for that daily. If you have never sewn one up call the vet. If she isn't up in a couple of days I would call the vet to take a look at her.