Au pair for 8-9 years kids for Summer

Hi I am looking for an au pair (native English speaker) for this summer for my 9 years old son and 8 years old daughter. 

We are willing the aupair to make reading and grammar games involving spelling with kids on daily bases as well as playing and swimming, to go around with them. Shehas to be gentle and getting well with kids and able to teach and play with them. She has to be tidy and nonsmoker.  On the other hand she has to be energetic to have more then one event a day.