When she uses any of her mobility ability throw a grumpy bomb close to u so u can stun her and kill her. When she use the ice block ability, put a grumpy bomb next to her and surround her with bomb. Then when she comes out detonate all the bombs.
Never us ice block around bomb king unless you are either trying to block grumpy bomb (try to time grumpy bomb’s detonation; quickly use ice block and immediately cancel then soar or blink away) or his ultimate. He’s pretty easy to deal with though.