I'd say it's good to make use of the replayability factor of YouTube videos to convey as much information as possible without it being overbearing. By having a small overlay that shows which button she pressed, people can have a better understanding, and if they want to pay attention to what she does and who she is, they could simply watch the video again focusing on the visuals. The Ezreal video that I mentioned (https://youtu.be/3EElFyFcaEk) does a great job at it by making the overlay small mostly transparent, only highlighting the ability being used, this way it's informative but no intrusive. That's just my opinion on the matter.
Copy that. Thanks for giving your input!