cast refusal

What is your philosophy on judging cast and whistle refusals? Are they judged with equal weight, for example A) Poor Initial Line (a type if cast refusal) B) Whistle refusal before entering water C) Cast refusal in middle of blind fading with wind (scallop) D) Cast refusal in middle of blind...

I have a 13 mo. old blf that has absolutely excelled in training thusfar and had been running cold blinds pretty well, particularly for her age ... however over just the last week or so she suddenly has started to refuse to take a direct over, oftentimes just sitting and staring at me. It began...