GK,
Good, then full steam ahead. Think about a good strength and conditioning coach.
As far as the video goes, do some research on available video cameras. You should be able to find on Amazon a decent HD video camera designed for amateur athletics in a kit with a tripod for about $400. Take the video when d goes to goalkeeper training sessions. The tapes will be better if shot outdoors. The amateur cameras aren’t that great with athletic movement with the low lighting indoors. Talk to her GK instructor about doing a range of skills. Then set up the camera and just let it roll.
Before you edit the tape, go onto You Tube and look at the goalkeeping recruiting videos, particularly the professional tapes. I think six minutes would be a long tape. Four minutes would be fine. If you can reduce it to 30 seconds per skill, that would probably be good. Then the video will become a conversation piece with the coaches. D can ask them what they thought about the tape, what other skills they want to see, how long for each skill.