I think irimi nage is O Sensei's way of making sure the smaller nages don't get too sure of themselves because of shihonage
Again, this is the reason I prefer partners to be quiet and train. Unrequested help/advice is generally unwanted/ unnecessary help/advice. Unfortunately, no matter how often you tell one of those types, they are too in love with the sound of their own voice to care about what you need or want. My first sensei would tell us that if you wanted your partner to get how to do the technique, you should do it clearly and correctly when you were nage, and be quiet when you were uke. Good luck with her!