Join Date: Jan 2011
Location: Los Angeles, CA
The divider is mainly in place to keep her from doing her business, and then sleeping on the other side of the crate. The only reason to really expand the crate is when your pup grows bigger.
The crate should be big enough so the dog can stand up tall, stretch, turn around in, and completely sprawl out in. Once he/she is unable to do so, it's time to expand the crate.
Since she is doing so well, (extremely well i might add), you can let her explore other rooms in the house, more freedom etc... When you are completely confident, that your pup won't mess up the new carpet, you might not have to crate during the night. But for now, I suggest doing what you have been doing all along, as it seems to be working well.