My girl leaving nursery

Hi. New on here. so bare with me 😀

My little girl leaves nursery on Friday. So upset about it. Obviously I'm sad about her leaving, but the main thing I'm sad about is that she's made 4/5 little friends and I feel awful because taking that away from her. I know shel make new friends but still sad about it. 

I've got nursery a present but shall I do a card for her friends (not all of them just the ones she likes!) and leave my details. Or is it weird? Just don't know wether that's the norm and I just need to get a grip?!
Sorry so long just want to sort it xxx