Backend login only to add new blog entries

I need to create a login for the girl I am doing the site for so she can login and add blog entries.

Would she be logging in under thesitename/administration or would her login be from the front page where it says "login?" The purpose of this login on the front page in the first place is so viewers can comment on blog entries, is that correct (for my purposes, I do not have any information that is only confidential for those who login)?

I am using the creativity template. www.makeupstarr.me

What would be the best way to go about setting her up to create blog entries?

The easiest way is to use K2 user profiles. Create new type with possibility to comment, and create articles and then publish somewhere on site K2 User module to provide links for this actions after login.