How to teach 3 year old to blow nose

mama

How does one do it? She just refuses all the time and she has a runny nose right now and I can’t get her to blow it but she is crying because she doesn’t know what’s happening and how to stop it. I go to her with a tissue and she just cries and bashes her head around so I can’t get next to her. To wipe it, I’ve had to hold her head down and then wipe, which is obviously then a traumatic link memory for her but I’ve tried so much to practise blowing a tissue when she’s been well or to practise on her teddy etc