Automated login

I'm getting this activity every 2 mins during my child's excluded curfew hours:

 

 5/5/10 5:48 AM : Signed-in during curfew hours [Chelsea]

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      5/5/10 5:46 AM : Signed-in during curfew hours [Chelsea]
  • on and on... all night long.  Any idea what is going on?   I doubt she stays up all night trying to login, can't find the program which has automated the WinXP SP3 logon.  She logs on on as a limited user, not an admin.  The activity makes it a pain to view her logs.