I wonder if some kinda licence restriction applies to the links she has posted? Copyright issues are the most likely explanation for such restrictions.
If memory serves, I believe the links I post are usually for vids that are uploaded under the YT general licence agreement, which have no restrictions attached to them, but don't quote me on that. I could be w-w- w- wr- wr- wro- wro- wron- wron- wrong. Golly gosh, that was really tough to admit, coz it happens so rarely.
Can you give me an example of what she's tried to post that didn't work?