You do understand that the vast majority of Irish people don't know the immigration rules for foreign people right
As a Chinese citizen, I have absolutely zero knowledge how to apply for a residence permit for China.
Jokes aside, just follow the official guidelines. The very first note on the EU1 form states:
"You should use this application form if: You are a non-EEA national
resident in Ireland who is a qualifying family member of an EEA national".
The process is rather straightforward. Once she's here, fill in the form, send it to the correct address, and just wait for the letter.