"She is a military doctor."
Translation:Is dochtúir míleata í.
Because you don't use the verb bí when using one noun to describe or categorize another noun (or pronoun), you have to use the copula.
You can't say tá sé fear, you have to say is fear é, and you can't say tá dochtúir í, you have to say is dochtúir í. Mileata is just an adjective, and doesn't change the primary "noun is a noun" structure of the sentence.
dochtuir mileata ata inti is not okay? i know i am missing my accents, but i thought in could be used this eay
It can, though it does have a slightly different meaning. If it's not accepted with the correct use of the fada, please report it as an error.