It may not be the healthiest thing but when our babies were teething and would not eat I bough some cheap soft food at the grocery store and they would eat that. If they normally do not get canned food a lot of times they will eat that also because they think it is a treat. When they are not feeling well I would rather have them eat some lower quality food than not eat at all.  
Make sure you watch her close so she does not get dehydrated or hypoglocemic.     
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