What day notice must I give?

[Luis Acosta]

So I want my ex-girlfriend to leave my house but she doesn’t want to. We share a son together. She has the internet, light and water bill under her name only. The house is under my name. Do I give her a 3 day, 7 day, 15 day or a 30 day notice to vacate? I went down to the courthouse but they said I couldn’t evict her w/o giving her proper notice to vacant form. Thanks in advance !