My experience goes against a lot of what amber said.
My pain was more in the shoulder blade area so not too far from the neck, (for me, bra strap areawhere it goes over the shoulder), and mine definitely did come and go for a few weeks even, a heating pad in the area helped a bit, sometimes. I slept through it, or did my best to, a few times. (I did see my doctor for it once- she didn't do bloodwork since I had none of the typical signs of pre-eclampsia. It wasn't until it hurt so bad it was hard to breathe that I went to the hospital, was admitted, and by the end of the day diagnosed with HELLP.)
Given her other issues, I'd give the doctor a call, they might not have her go in but may order bloodwork to see what her liver enzyme levels look like, specifically. Probably it's just pregnancy, but when it's your first, it's almost impossible to know what is normal or not. I dealt with that pain (which for me moved all over- sometimes my rib cage, sometimes my back, sometimes my shoulder blade) for a couple weeks prior to being diagnosed (my bp and everything else was normal except her growth) , I thought it was normal. My pregnancy with our son was normal and I never experienced anything close to the pain from hellp.
Me (29) DH (30)
#1-Olivia Caetlyn-9-28-09-9-28-09, 23+2 wks, emergency classic c-section, class I HELLP, IUGR
#2- Lucas Oliver (rainbow baby)- April 2011, 36+2 wks, HELLP and pre-e free! (lovenox and LDA pregnancy)
#3-Matthew, late October 2012...mostly normal, 37 wks, (lovenox and LDA again)
My blog: http://www.butterflies-and-rainbows.blogspot.com/