J.E.
Hi D.,
My son is also 3 and going through the same thing. He says he can't blow his nose...finally I had to get a nasal aspirator and suck it clean. He hated it and screamed but his nose was just bubbling over with mucus. He would either pick it or wipe it across his cheek, I was afraid of impetigo. So I used the "nose sucker" much to his dismay. I only had to use it a few times and he got over his cold so it could have been worse, I have no idea what to suggest to get her to start blowing her nose again.
Hope this is a little helpful anyway.
Jess