I have two Yorkies, and they are as different as night and day. Shiloh my male is the oldest and is what I lovingly call a "teapot" Yorkie (meaning he weighs about 7lbs), he has a fluffy cotton coat and floppy ears. Lorelei my baby is teeny tiny, at one year she weighs about 2lbs, has a silky coat and perked ears lol. I love them both for their different aspects and their personalities. When we first brought Shiloh home his ears were down, we did shave them and I attempted to tape them but he hated it so much I took it off immediately. Lorelei has always had perked ears. Shaving and taping may help them to come up, and also if she is teething it can cause them to droop down. Since her ears were up when you picked her from the litter my guess is that she is teething. Good luck with all your little lovelies and welcome to YT you will love it here, I know I do!