Sounds like eclampsia. here's a link with info
Eclampsia (Puerperal Tetany, Milk Fever, Hypocalcemia) in Dogs. You must get some calcium into your girl. There's a recipe for whelping pudding which is very good to help restore her. Do a search here on YorkieTalk for it. Eclampsia is also called milk fever and is recommended the pups be supplemented rather than nurse. She really should see a vet but if that's not possible get calcium in that girl NOW. Ice cream can be used also and there are calcium supplements available at pet stores. DO NOT let this condition go untreated. It is very serious.