I had a really hard time with this chord a couple months ago, too. I came here to the forum where I got some tips to just keeep trying. So, I kept trying but I also went back and reviewed the video for the d chord and d chord changes. Then I had an "aha moment" and realized that I had been doing a few things wrong. I was then able to correct what I was doing and I finally got the D chord. I came back to the forum,super excited, and shared my success at finally getting it.
So my advice is to watch Lisa make the D chord over and over and over and over. You may see what you are doing wrong or can improve upon and I'm sure with tons of practice you will get it.
“Often, what seems like an impossible climb is just a staircase without the steps drawn in.” Robert Brault, American Operatic Tenor