Here's my comments:
1. Get a mat. It will help you and the dog know where to come back to.
Agreed. She is familiar with a mat, but I don't own or train with one.
2. She looks like a young dog. So I wouldn't pinch the marks in yet. I would throw both the marks in the same direction. Like in this situation both marks thrown to the left. Note how she was indecisive as to which mark to go to when sent on the first mark. She kinda split the middle at first.
She looks a little young, but will be four this Spring and will be (hopefully) running Master this Spring- if my schedule works out. She's just a tiny girl, just under 50#. We've been working on different concepts. Yesterday we were 'going over' converging marks.
3. Test the wind before you start to setup.
Agreed. I retested because I thought it shifted a little, and it had.
4. Make the dog sit before sending on second mark.
Agreed. Was sloppy on my part.
5. Don't throw from the line, in this instance just run a double.
I usually don't throw from the line, but with one winger being out of commission, I said what the heck.
6. And Howard's favorite comment to me, quit figgiting on the line.

This seems to always be a problem.
7. I couldn't tell much about the blind. You might want to run blinds outside the marks for a while. It looked like she was popping but I couldn't tell because I couldn't hear the whistles because of the wind noise.
The wind was pretty bad, which was messing with the audio. She never popped, but can I definitely understand the conjecture.
Even with all my comments above, I thought you'll did a good job.
Thanks!
P.S. Where was your heeling stick? and ecollar transmitter?