*facepalm* Since it's obvious you or an associate have access to this forum on AYR, Yowee Downunder, please understand that you are on shaky ground with your claim Dee gave you permission to use her video content.
You did not LINK Dee's video, as she asked you (and which you showed in your latest video that Slats posted above),
you incorporated it in YOUR video. That is not LINKING to the original content.
Also, international copyright laws mean that as soon as Dee posted her videos on her YouTube channel, it was automatically copyrighted to her, as the channel owner and creator of the video.
YouTube copyright information, specifically the second point at the link below answers the question "Can I use a copyright-protected work without infringing?"
https://support.google.com/youtube/answer/2797466
Since you claim in your latest video that you can do this with Dee's content, with or without her permission for 'educational purposes':
"1. The purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes
Courts typically focus on whether the use is “transformative.” That is, whether it adds
new expression or meaning to the original, or whether it merely copies from the original. Commercial uses are less likely to be considered fair, though it’s possible to monetize a video and still take advantage of the fair use defense.
Claiming Dee is 'OK with you using her video' is a bit of a stretch, but in any case, she is annoyed enough at you now that it's totally within her rights to file a Copyright Infringement if she wishes, no matter WHAT she said in writing. That's her perogative, to control how her content is used. If you'd linked to her vid in the first place, as she stated, none of this would have probably blown up like it did, as you probably well know, so whining about it now is a bit ridiculous.
Shazz