I gave my android to my daughter. She cannot link the device to her own google account because it is linked to mine. How can we unlink the android from my account without her loosing her data
What do you mean by unlinking your account, and that your daughter can't link her account? Usually, you just remove your account by going to Settings>Accounts>Google>Tap on account, then remove account. Then just add your daughter's account. If it's something else, please post more specifics.