Oh, my goodness. That baby is so little and young. London is beautiful but I'm a little worried about her. It's generally not recommended that any Yorkie puppy go to it's new home before 12 weeks old and absolutely not that small. "Teacup" issue aside, how are you going to keep this little one from getting hypoglycemic?
Are you able to stay home all day to supervise her and make sure she eats many small meals a day? If not, you may want to get someone to come stay at your home for many weeks. It's pretty important that she stays warm and doesn't get chilled (too cold increases the metabolic demand of the body increasing calorie consumption which leads to low blood sugar), doesn't get injured accidently by people or animals, and doesn't skip any meals. I would also recommend Nutrical multiple times a day for nutrition and to stimulate her appetite. What kind of puppy food is she eating? She needs to be on a good quality puppy food that she is able to eat easily. At 11 oz I'm worried that she can't crunch kibble enough to eat without tiring herself out. You might look into Royal Canin mini puppy 33 - it has tiny little kibble that is able to be crunched by tiny puppies.
Again, London is very cute and I'm sure you want to do what's best for her but you are going to have to be very careful with her at this age and weight. Please contact me with any questions. Please let me know who her breeder is? Good luck with your new baby.
Teresa