If she's sleeping I leave her laying down and hurry up. If she's awake I will either leave her in her jumper or take her with me and hold her on my lap if I absolutely have to
Just leave them where they are, that is if you're at home. If my son was crying I've totally gone while holding him. If I shower I bring the baby monitor so I can hear him but I only do it when he's asleep. Theres been times though as soon as I go to the bathroom he starts crying. lol