Click Invite Member By Link or enter the e-mail of the person you want to invite. Click Send Invite.
Then, so your family members can accept your invite, get them to follow these steps:
If you already have a Free or Spotify.com-created Premium account: the “Redeem token” web page will open in your browser with a long redeem token number pre-filled in Token. Click Redeem.
If you do not have a Spotify account: you will be led to create a Free level account. After doing so, click Accept Invitation again on the email and the “Redeem token” web page will open in your browser with a long redeem token number pre-filled in Token. Click Redeem.
Be sure that the email address you are issuing an invitation to, is already associated with an active Spotify account. Because it's important that when your daughter opens the email invitation, she uses her own person login credentials to accept the invitation. Have her open the email in an incognito browsing session if it's still not working.
Hope it work of course! Let us know if you have further questions.