Hi Kimberlee,
Yes it's just heartbreaking when you ask about your child's day and they say that no-one would play with them or they were alone at lunchtime. I found that as suggested to go earlier and let them lead you through their new life there but also assist them in meeting other kids. Get involved in what other children are doing, ask them questions and also talk to them on the playground so that your child feels more comfortable talking to them also. They can learn their names and you can introduce them get the conversation started, it's even hard for us adults to spark up conversation with new people so our children need help too! Perhaps meet the parents of some children who they seem to click with and organise playdates after school etc....
It just takes time, don't make it too much of a big deal or appear worried, I found that by making it an issue it stressed our daughter more, I just said 'Yes it's is tricky, making friends can take a bit of time but never mind, there are lots of children to meet!'.
I'm sure she will be fine, talk to the teachers if you are really concerned I'm sure they will be more than happy to report anything that concerns them....
Jennifer