I have bought a phone for my daughter through my apple account, how do I transfer it to her, including applecare.

Hello,

If you haven't set it up yet, your daughter should be able to set it up by using her existing Apple ID or by creating a new one:

Set up your iPhone or iPad - Apple Support

If you've already set it up using your Apple ID, do this:

What to do before you sell or give away your iPhone, iPad, or iPod touch

For AppleCare+

AppleCare+ for iPhone

Transfer your AppleCare plan - Apple Support

Good luck.

P.S. save your receipt: Keep your receipt after you buy an Apple device