Well you got a 2nd bunny...and you did rescue her! Babies are almost impossible to litter box train....they are young, incredibly active..and I think of them like a 2 yr old toddler....they are too busy exploring and having a great time to stop and go to the bathroom....same w/buns. You'll continue to have trouble until she's spayed....even then it takes another 4 wks or so after that for the existing hormones to get out of her system..... Spaying will calm her down, make her urine less strong in smell, save her from a reproductive cancer and make her more people friendly....But for now you are stuck. The only thing you can do is to control where she is allowed to go and I would not suggest you leave her out and unattended.

And J's jealousy is not to be unexpected. I would let them continue to meet through the cage bars and one day when you have a lot of time, bring them out together...with you sitting on the floor in the middle and one bun on each side. The minute one attacks the other, break it up bef someone gets hurt and try again many hours later. I expect you will need to do this for a good week - week and a half, maybe even 2 wks...it depends on just how jealous J is. But they will be friends eventually, it will just take time. For more bonding tips go to www.rabbit.org and look for the behavior link....I think that is where they have the bonding info.

Good luck! And congrat's on adopting Tyah.