Why wouldn't i be able to erase google accounts?

I have searched online for a response to this and nothing works for me. My companion signed into her gmail account through my telephone to check an email. Presently I can't make sense of how to erase her record from my telephone. I can make mine the primary record however regardless I get her gchat messages and her data is still in my telephone. I have had a go at erasing it from Gmail Support Number the gmail application and in the general settings in my telephone. I see where to include records and take a gander at the present ones yet there is no place to really erase a record that I can discover. Can anybody offer assistance? Much appreciated!

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