It's normal. My DD2 does this now too. I just give her a cuddle and sit down again until she is playing and happy for me to leave, or just take her with me. IMO she knows what she needs right now and if I try to resist or just ignore her she will just get more distressed and it will make the situation worse. So I try to comfort her and hope that teaches her that there's no need to worry because I'll always be there. HTH