I'd say something like 'thank you for all your advice the other day. I have looked at Mrs.......books and yet she doesn't seem to have anything different to me. Are there any other teachers you know have what you are asking for whose books I could look at? I really want to get this right.' Then you are showing that you are taking your role seriously. You are listening to your mentor/HT. And that your colleague isn't doing what she should. Sorted!