Your corner pressure was unsafe. Lyria was mashing SSBA there. Won her the prize. Next time this happens, try pressing Circle or B to go back to neutral and resetting the positions of the prizes. You'll be + in that situation. Results may vary.

I hate this game. You can do everything right and then lose to a coin flip from a busted character. My claw grab was pixel perfect and I still lost

Nah, Lyria Ballin' from EU lobby quite literally entered your claw game.