Can she do this

okay i am fairly lame at computers but tell me if this can be done. recently my girl of 6yrs moved out with a friend(nicefriend)she is very good at computers and has had acess to mine before she left and when i was tooling her yesturday. Lately my computer has been acting funny and my settings keep changing to remote user, i have been trying to put in ip adrs.. mac adrs.. thats how i ended up here. one the adrs.. i looked up brought me right to her name http mdavenport2003. She has been able to check my comp. yes or no thanks, bros before hooos