All perfect praise be to Allaah, The Lord of the Worlds. I testify that there is none worthy of worship except Allaah, and that Muhammad, sallallaahu ‘alayhi wa sallam, is His slave and Messenger.
There is nothing wrong with just playing with this little girl but it is not proper to play with her in excess. It may be more appropriate to avoid this especially if this is something unusual in your community. If you fear temptation, you must avoid her in order to avoid prohibitions and the causes that lead to temptation. For more benefit, please refer to Fatwa 92003.
Allaah Knows best.