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How does the existing user join the Family Premium account? Do we (plan manager) send the existing user the Family Link? How do they merge?
Welcome to the Community and thanks for posting your questions here!
Yes, you can send your daughter an invite to join the Family plan you manage.
You'll always find the invite by logging into your family page at www.spotify.com/account/family.
Your daughter can use her current Spotify account to join, keeping her own saved music and playlists.
You can also take a look at this support page article to get all the necessary info regarding Premium Family.
Hope you'll find this useful. We'll be here if you need any further help with this or anything else 🙂