She's very cute.
That kind of rack isn't really used much anymore. It's uncomfortable, for one thing--that's probably why she's shaking her head so much.
I'd take a look at our tutorial for another method a lot of us use.
www.dobermantalk.com
If she is still bothering with the rack at this time of night, I personally would go ahead and take it down, go out and get the materials you need tomorrow and try the backer rod method.
Now, you do need to know that even with that method, you may get a little bit of head shaking, though usually they adjust quite well. If they are still shaking their head a lot, that generally means that you don't have the backer rod seated deeply enough in the ears. It may take you a few attempts to feel reasonably comfortable about it--you'll feel all thumbs at first. But after a few postings, you'll have the hang of it.
It's getting late in terms of folks here responding to you tonight--tomorrow more folks will chime in. But keep asking questions, post pictures of your post jobs, if you'd like, and we can see if we can give you tips to make the process a little easier.
That kind of rack isn't really used much anymore. It's uncomfortable, for one thing--that's probably why she's shaking her head so much.
I'd take a look at our tutorial for another method a lot of us use.

How to: Posting Show Cropped Ears Using Backer Rod
Everyone has a little bit different way of posting ears. This is the method I use and I'm posting my 4 month old puppy as an example. This should work on younger as well as older puppies, although you may need to adjust the backer rod size 3/8, 1/2, or 5/8" depending on your pup's age. I...
If she is still bothering with the rack at this time of night, I personally would go ahead and take it down, go out and get the materials you need tomorrow and try the backer rod method.
Now, you do need to know that even with that method, you may get a little bit of head shaking, though usually they adjust quite well. If they are still shaking their head a lot, that generally means that you don't have the backer rod seated deeply enough in the ears. It may take you a few attempts to feel reasonably comfortable about it--you'll feel all thumbs at first. But after a few postings, you'll have the hang of it.
It's getting late in terms of folks here responding to you tonight--tomorrow more folks will chime in. But keep asking questions, post pictures of your post jobs, if you'd like, and we can see if we can give you tips to make the process a little easier.