After you have done the basics (Put plug covers on all the outlets, have breakable and dangerous things out of reach, you have crawled through your house on hands and knees and looked at everyting the child might be temped to get into, and secured it, you have knob covers on the stove, latches on all the cupboards, your stove is attached to the wall (so it can't tip forward and crush her if she were to climb on to the door), she has no access to drapery cords, hammocks, pails of water, ponds, pools, etc.) (Each of these items have resulted in a child death - the child who strangled to death in a hammock was 8 years old), it really depends on the child.
My boys were the type of kids that you could never let out of your sight. They would push little chairs up to door latches so they could reach them, turn off baby alarms, bowl over baby gates at the top of stairs to knock them down. Whenever I would plan play dates for them (even as preschoolers) I would tell the other parent, "This is not the type of child you can just turn loose in a play room, he needs to be in your 'line of sight' at all times." It was not because they were naughty or aggressive, it was just because they were extra smart and would think of things to try that as a parent you could not anticipate.
Can you use the restroom with her just outside it and the door open? How mobile is she? (Walking and running? Climbing? Czn she open a door (like the front door, if someone knocks on it, while you are on the potty with your pants down?) Is she on the verge of learning anything new (like, you can't trust that she won't do something because she has never done it before, kids learn new tricks every second of every day). If in doubt, put her in the crib with a few favorite books while you do something that takes all your attention. In other words, with some kids, you can turn your back, if they are in a safe and confined area, but don't count on it. It won't be long before they will outsmart the childproofing. The purpose of babyproofing your house is to put a few more seconds (not minutes) between your baby and disaster. If gives you a chance to react. It is YOU that keeps them safe. But yes, you still can sleep, go potty, eat a sandwich alone, etc. You just have to have places in your environment that are completely safe. And make sure your crib is up to code, not an antique. My boys were raised in an antique crib, that did not meet code, but I stuck their head up to the bars and it didn't fit through, so I thought they were OK. Only after they had outgrown the crib did I learn that it is not the head that goes through, it is the body, and the child strangles to death with their head stuck inside the crib and the body out. B.