Write the correct direct object pronoun to replace the words in italics. elle invite. (moi)

Even though the direct object pronoun of moi is indeed me (like the other person said), because the verb starts with a vowel, it has to be shortened.
So, the correct answer is:
Elle m'invite.
This sentence means - She invites me. 
You have to use the apostrophe to shorten me because two vowels cannot stand next to each other like this.

I already answered but thanks