There are several words for 'girl' in Irish:
Dia
Dia
of God - Dé
"Celtic goddess" is "bandia Ceilteach"
bandia
banphrionsa
'Irish princess' would be Banphrionsa Éireannach in the Irish language.
There is no direct Gaelic translation for the word princess as their monarchical succession was based off election not birth rite. Flaith would be the closest word that would translate as is based off a position unconditional of the sex of who held it.
'Iníon na hÉireann' in Irish;
In Irish it would be 'banphrionsa Éireannach' or 'banfhlaith Éireannach'
banfrinsa aeranokh (Banphrionsa Éireannach)
Mo Bhanphrionsa Gaelach / Mo Bhanphrionsa Éireannach
From Irish Órfhlaith (golden princess) now spelled Órla.
Irish Wolfhond
Banphrionsa Ghaelach or Banphrionsa Éireannach in Irish;Scottish Gaelic: ?
The word 'princess' is a noun, a word for a person.
Your in Irish Gaelic is: bhurthe Irish word for your is: bhur
Irish: fairy princess of the field.