Taking her pill - "beware.....take your pill tonight".

My partner went out the other night with her work mates. When she got home she went to up to bed, and as I was still awake downstairs she asked me to take her phone to her. As I picked it up I saw a message from one of her friends saying "beware.....take your pill tonight".
Why would her friend be telling her that ????????
To me there is only one thing that I can think of. She was going to go with someone while she was out.
I have asked her about the text and all she said was she didnt know why her friend would text her that but wouldnt say any more.