No, your colorist will not need to pull the color through when touching-up your highlights. She should be able to touch-up just your regrowth and there are a few methods that she can use that you'll probably be very happy with.
Yes. It is possible.
yes
No, you cant it will REALLY damage your hair =/
either dye the highlights to match your natural hair colour cut them out or wait for them to grow out
yes
Yes.
It'll cover them up.
if you get color red
If your highlights or hair dye are strawberry blonde, probably. But wouldn't it just go blonde?
harmful
Yes you can and It looks fabulous.
yes blood