Hi Wishfairy,
I've been through intense jealousy myself in the past so I know what you mean, yes it's horrible. :(
Lachesis is the main homeopathic remedy for jealousy, and I've just remembered the Bach flower essences Holly and Chicory are for jealousy too. I think out of the 3 the Chicory Flower essence sounds the nearest in temperament as she is so loving to them at other times.
I found this description...
"Chicory (Bach)
For the overly possessive and maternal animal that wants attention all the time and is also jealous of other animals or people who might compete with them for affection".
It sounds to just fit the bill!
You can get both homeopathic and Bach remedies at Boots and health food shops.
http://www.boots.com/shop/product_list_new_template.jsp?classificationid=1017043 [link]http://www.boots.com/shop/category.jsp?classificationid=425&wblinktype=SSN&wblinkdetail=SM[/link]
If you click on the individual remedies there's also a link for a pdf file on how to use them too if you haven't used Bach or homeopathic remedies before. :)
Hope this helps you. :)
Kath.