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I m sorry your girl has this trouble. It is most likely an allergic reaction. Cod liver oil is not harmful unless you give too much due to the vitamin D it contains.
You would be better off giving her salmon oil:http://www.petco.com/product/109074/Wild-Alaskan-Salmon-Oil-Cat-Food-Supplement.aspx
If she is constipated she can have an ounce of whole milk every day. It is a natural laxative.
For her nose apply a dab of raw honey. That will heal it up quickly.
Please let me know how she is doing.
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