How long a Yorkies coat goes through this "awkward" stage while it's growing out into their adult coat? I love her to absolute pieces, but I can brush it and literally turn around and it's all over the place again!

Her adult silky fur up next to her body doesn't do this. It's what's around the edges that drives me nuts! It's the black puppy fur. Not her greyish-black adult hair.
Also, the hair on the top of her head is growing out silver. Around her face/beard area it's still tan with a black streak going up the center of her forehead. Wil any of this change to all tan? I know only time will probably tell, so how long does it usually take for all these changes to occur? It is amazing to see how many changes she has been through in these last 3 mos!