Over on a certain other giantess oriented site, (I am not sure if we are allowed to mention other sites here or link to them or not) They have obtained (legally through an audition site) several pages of a script for this movie, currently in pre-production.
http://www.thefilmcatalogue.com/cata...l.php?id=12446
If the script holds, the growth appears to take place in spurts. With clothes ripping/button popping and the subject being surprised by the same, in the middle of a classroom. She spends a portion of the movie as a mini-gts, but, again if the script holds, eventually is at least 35 feet.
I didn't see it mentioned here. Yes, I did search for "cheerleader", and read all the posts I saw with that world going back about a year. I could have missed it, but I know I didn't miss the actual script and dialogue being posted here as it was on the other place. And hey if this is a repost, and my searching missed it, I guess you will have to sue me.
In either case, it sounds like a certain type of growth situation that even the goofy B-Movies don't cover very much. Budget is 3 million, so it won't be stellar, but it might be a cut above blue screening it.