Considering your approach to discipline, I think what you need is a large dog cage. You can put blankets over the outside of the cage, for top and sides. Then you could look inside whenever you want to, or cover it when you want to, without opening the cage.

Also, there should be a blanket inside the cage for her to lay on.

The next step would be to get a metal chain and a padlock, to make sure she can't open it from the inside.

Assuming that she gets bigger, of course you would need a big enough cage to accommodate a full-grown young woman. She might stop growing taller at about 15, but she would still be legally subject to your discipline.

With the baby pacifier or "dummy" device, this can limit the backtalk, as Rachel says, or reduce the amount of crying.

They do sell "adult baby" pacifiers or "dummy" mouthpieces, some of which have buckling straps to go around the back of the neck.

Again, there is always the possibility of using a small padlock to keep her from unfastening it herself.

There are a lot of cute items you could buy, which are sold as "adult baby" supplies.

You can remind your daughter that she is not a grown woman. She is a child. She acts like a child. And she will be treated like a child.

When she gets whiny, and she's acting like a big "cry-baby," then she can wear a pacifier in her mouth.

They also have cages that look like large baby cribs, with wood beams like "jail-cell" bars.

https://www.thesun.co.uk/wp-content/uplo...

thesun.co.uk/wp-content/uploads/2016/12/nintchdbpict000289373916.jpg

If you have a large enough cage, you could cover the top and sides with blankets, and this could be your spanking room, if you can fit inside of the space with her.

Of course, you want to lock the door in the OPEN position, whenever you have to get inside of it yourself.

In any case, as I say, you should plan on her growing taller, and get a large enough cage that she can lay down in it.

A lot of closets might be wide enough, and with wide doors, but not deep enough. You could still use the closet space you have, and add to it by building a new wall a few feet out into the room.

Just tell a carpenter that you need a bigger closet.