Well you see, stasis is a SYMPTOM, not a disease. So I think how they explained it to you is a bit wrong. GI stasis can happen when a rabbit is unable or too stressed to eat so the intestines slow down and/or stop moving. It is often secondary to another problem- pain from something, tooth issues preventing them from eating, infection, general stress, etc.
My non-professional theory is that Belle has stasis
because of the head tilt, not stasis
and head tilt. Head tilt is disorienting- just think if your head was angled wrong all day! It's very stressful and you already noticed that she has trouble eating with her head angled wrong.
What Belle needs is lots of supportive therapy- lots of fluids and some food, syringed if necessary. Pain meds would be nice. If you can get it, Critical Care would be a good choice for syringed food because it includes probiotics to help encourage good bacteria in her gut and extra vitamins to give her energy and support her immune system while she is feeling poorly. If you can't get that (mainly only from vets), you can make something similar by making a mush out of Belle's regular pellets and adding a little bit of Nutri-Cal and Benebac. Canned pure pumpkin is another good syringe-feeding food, and many rabbits really like it. I mix it in the pellet mush to improve the taste, or feed it on it's own if they'll lick it up.
Here's info on stasis, I highly recommend reading through it:
http://www.rabbitsonline.net/view_topic.php?id=28622&forum_id=10
What meds is she getting for the head tilt? Is it just Panacur so far, no antibiotics? Or does she have antibiotics now in case it's an ear infection?