Millia frame data for Guilty Gear XX Accent Core
Taken from the Accent Core complete guide, with additional notes on move properties.

WIP guide to AC Millia
Written by Teyah and blitz.  The thread was started in 2008, and it’s still not complete to this day so I think it’s safe to say it’s abandoned now…

Millia’s page on the Japanese GGXX wiki
If you can read the language, this gives a breakdown of Millia’s gameplay that is much more detailed than anything I can come up with.

Kuno’s webpage
Kuno is a Millia player who makes a lot of combovideos.  If you can read Japanese, his page has some very good notes on the character specific adjustments that Millia has to make in her combos.