That's a touching story, I'm glad it all worked out, that umbilical cord training sounds like it'd work well for older dogs (non puppies). Welcome to YorkieTalk! I haven't heard of that mix much myself, but if you can, post up some pictures, we'd love to see Trinket!
And yes, feel free to discuss your Yorkie Jack Russell baby here! Does she look like the one in this thread?
http://www.yorkietalk.com/forums/sho...ck+russell+mix