Spoiler Dawnguard questline; other way to becoming a Vampire Lord

[Boethiah9798]

yes she does but if you don't become a werewolf you only need to change once

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[Runic]

After a while Serana becomes human again and doesn't talk to you so it's not infinite if you want to become a Vampire Lord you have to do it fast. I hope this helps.

 

[DrunkenMage]

After a while Serana becomes human again and doesn't talk to you so it's not infinite if you want to become a Vampire Lord you have to do it fast. I hope this helps.

She only becomes human if you ask her, depends on the choices you chose when speaking with her throughout the quest line.