Not to put anyone's comments down or anything but you don't have to be a Vampire Lord to get Ingjard to be a follower. I just near the Dawnguard DLC and then went back to Fort Dawngurd went up to Ingjard opened the dioluge box and asked her to follow me to Sky Haven Temple and made her a Blade. I did that on my PS3 .
(Edited by A Fandom user)