Those "contractions" to me look like the workings of abdominal air sac(s) there are 2 of them.
Interesting right there at the end, there is almost Bubble that comes out of the skin. Just once.
I'm sure @Eggcessive will chime in with her thoughts. I would like to see what @casportpony and...
Good tips from everyone.
I would not withhold water and offer her wet soupy food. I understand she's trying to push, but dehydration will make her situation worse. The standing and hovering with eyes closed, she's not doing well.