help, trick for straight legs

[JDchicks]

I had a brahma hatch. She lays on her stomach with her legs stretched straight out behind her.

When I hold, I make her pull them up and stand on them. She does fine, although a little wobbly, while I am holding her.

After I put her pack in the brooder, she will stand on her legs and move around for a while. But then an hour later she is back on her stomach.

Is there any trick that I can do to help her? Its almost like her legs tire out, and she goes back to her belly and can't get back up.

 

[JDchicks]

Here is a pic of how she lays. She uses her legs and feet to scoot around the brooder. But she still wont put them under her, unless I do it for her. Then she will do it herself.

But an hour later, she is back to scooting.