Is this illegal ?

Me and this girl were having a fight and I recorded some of it where she called me names. I don’t have her on video only her voice and she’s telling me to delete it or she’ll get her mother down to my house. I told her no because she isn’t in the video so I won’t delete it. She was talking people I was psycho as I “followed” her down to her house when that isn’t true I was trying to talk to her and she telling people that her face is in the video when it isn’t.