How to say "Throw something at someone"
Throw something at somebody:把(东西)扔向（某人）。
She threw cards at us:
她把卡片扔向我们/她把卡片扔给我们/她朝我们扔卡片/她向我们扔来卡片

However, If playing cards, We don't say it like above. I think we just say "她向我们打出xx牌".
Playing cards: 打牌/打扑克Playing poker