Hi Kelly, well I wouldn't worry too much about what your daughter is saying about friends,I have a 5 year old who has just started school and quite often plays all day by herself,I think it takes quite a wee while to establish friends and I do know that girls can be quite catty with each other from a very early age, its hard if your daughter is sensitive,(mines not)Have you spoken to her teacher and asked about her behaviour with kids within the classroom?
I hope she finds freinds soon, as I know it worries the mums probably even more than the kids, good luck Donna