Nursery crying

Hello! My little girl started nursery last week. The first 3 days went great, even her first full day she came out really happy. Since last thursday the staff have been telling me she gets upset in the afternoon, cried and says she misses me. I feel like since then she has made a habit of it (possibley because she has had some extra attention from staff). She has cried every day since although they said today was better. Its not like she is crying the whole time, mostly when she sees other parents collecting some of the kids at the earlier pick up time (which i cant do) Just wondered if anyone else is in the same boat and if they've managed to resolve it. The only things i can find online focus on drop off and thats not the problem as shes delighted to go in. For background my daughter is a pretty independent kid. She has overnights with her granny etc fairly regularly so its not that she cant handle being away from me. I get that its normal for them to be upset but im getting really stressed knowing she is sad. She is so enthusiastic about actually going and when she leaves she always says she cant wait to go back again which is a good sign. I just wish she could fully enjoy herself! I know she will love it once she gets into it more but i just want to help her ❤️