Background:
I used to work at same place as her until last year. Last year I told her colleague I saw her on Instagram and said she looks good. That person then told her. She has then confronted me about this.
Last week I went into her workplace, spoke to some ex-colleagues about job cuts and so I asked is she still working there. I also asked if other people still work there. A person that overheard the convo has then obviously told her.