Molly Weasley being off with Hermione

[Jayne]

No: HPFGUIDX 180994

I have a query from GoF which I have just re-read.
When Harry is going to the third task he sees Molly Weasley who has
come to support him. She is rather cold to Hermione as she has read
the article written by Rita S saying the Hermione is Harry's girl
friend.
What I want to know is why this would bother MW?

My theory is that she knew that Ron fancied Hermione and she felt that
HG was betraying Ron. I am probably wrong, so any comments.

Jayne