I hope you quarantined her from your breeding group. It could be any number of things. It almost looks like a seizure, but it could be an inner ear infection. It looks pretty severe regardless.
http://ratguide.com/health/auricle_e...yrinthitis.php
Has she shown any signs of a Respiratory Infection? Is that her litter of pups? Is she currently pregnant? If she is pregnant/had pups recently, it could be a complication.
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