[Luvboduke]

I have a female 14 wk old puppy, she is my first yorkie/toy/female dog. I have so many questons about her care vet/groomer have helped some but I could really use some input.
Lucy has a cotton coat, what is the best way to prevent mats, and remove them? She mats so easily.
Will her coat possibly mature to more of a silky coat as she grows up?
Also, her hair grows fast, she already has to have a full service groom to shorten her hair so it will not mat so badly. Will it slow down as she grows up?
She is also a large puppy, she was the only puppy in her litter. She is over 5 lbs and mom and dad were 8lbs and 6lbs respectively will she prob be about 7 lbs full grown? Since that is in between her parents weights?
Thanks in advance for the info.