I guess she's calling it film because it's not going to be released on DVD only... It's going to be released in Blu-Ray too, so she can't refer to it as DVD or Blu ray only...
I also think the editing part must be finished or nearly finished as it's been almost 6 months since the tour ended. She said two more months simply because it'll be much easier to sell by the end of the year, with Christmas and all. Remember a part of Candy Shop was featured on the editing company website a while ago and it said it was in post-production phase.
She and her team obviously don't need 8 months to edit and finish a DVD/Blu-ray. Other artists have been doing it in under 1 month, so... It must be pretty close to being ready, it's just a matter of financial interests.