hmm ok this is interesting.
you certainly have down some of the basics for playing shiek, but i noticed a few things that i see in MOST beginner's games.
first and foremost is low level players roll entirely too much. when zelda respawned, you ate a forward smash in the face because you rolled predictably. that zelda, if the player is any good, will eventually catch on and start down smashing whenever your roll is anticipated. im not saying you need to cut rolling out entirely, but i would say that about 1/3rd of your rolls wearnt particularly great moves.
secondly, i would suggest that shiek's down air is her worst airiel, and i saw you using it a LOT. as shiek, you want to try very hard to avoid being directly above someone, as this is shiek's weakest point. if you come from higher than your opponent, try to be to the side. that way you can use either needles, or forward/ back air instead of down. if you ARE comming down on top of someone, you're better off using the neutral air and fast falling.
i saw some good movements for sure, you have a decent grab game. i would defently follow randizzle's advice, though. i noticed that when you started dashing towards the opponent or jumping at the opponent, you were moving in for the attack every time. try to fake them out more.
practice L canceling. practice wavedashing. you're on a good start.
finally, i would suggest putting a video against a higher tier character. im not saying your friend playing zelda is bad, but we'll have a better idea of where you stand and what you need if you show us a vid of you playing a fox about your skill, and one against a marth. fox is tricky for shiek, and marth is extremely easy.
good hunting.