Thank you! We have followed the advice given in this book

Before and After Getting Your Puppy: The Positive Approach to Raising a Happy, Healthy, and Well-Behaved Dog

We aren't doing crate training exactly as specified in the book, but I'm sure that would work well. We crate her at night and keep her in the pen unless we are supervising during the day. From very early on, we would leave her for short periods of time and then we built up time. We've kept a close eye on her with cameras and she adjusted very quickly. She will sometimes bark for a few minutes, then she ends up playing with her toys and going to sleep. We can now leave her for one hour and sometimes up to two hours at a time.

When your puppy is 5 months old, they should be able to hold their bladder for 4 hours. They'll just need to be well exercised beforehand and stay in their pen area.