Seekers (members of the Blood of Vol) seek to open the Divinity Within. Vol doctrine states that blood is the source of life, and without it a being is not truly alive at all. As a result, Seekers believe that blood holds the key to myriad doorways of power and wisdom, including the greatest doorway of all, life everlasting.
Because the death plane of Dolurrh is a grey waste where spirits go upon death, and which eventually dissipate into nothingness, Seekers are indeed looking for ways to gain "immortality"-- inasmuch as really just avoiding the complete loss of soul and identity after a time in Dolurrh. So rather than her parents "experimenting" on her with dragon's blood or whatnot (which has negative connotations)... their efforts might very well be done out of love. A love of their daughter so grand that they were trying to unlock her Divinity Within so that she would never suffer an eventual non-existence after her death. Unfortunately, it blew up in their faces (sounds like literally.)
So she now has this magic inside of her bursting out-- whether the dragon's blood given to her unlocked this magic or actually caused this magic can be up to you-- and she now could be a very important person to the Seekers and the Blood of Vol. What ways could she be important? Perhaps now she actually has unlocked the Divinity Within, and cannot actually lose her soul in Dolurrh... and perhaps even can come back from death? Perhaps while she can still die and find herself in the death plane... after a time she is able to pull herself back out and return to the land of the living as herself? This of course would not be something known to her right now... but might be revealed to her if/when she dies the first time in the campaign. After a period of time maybe a week, maybe a month, she comes back. Heck... maybe she in fact already has died once-- maybe that explosion of her power when she was a small child that destroyed her family's home actually killed her too at the same time... and she eventually came back from it, unaware that she had been gone.
Doing something like this would also give you a really strong antagonist group for her... other members of the Blood of Vol trying to find "the girl who came back" so that they could get her and figure out what exactly her parents did to her that allowed her to return to life. She might indeed be the secret to unlocking the Divinity Within, and she'll be hounded unto the ends the of the earth so that others may discover the secret.
Lots of ways you could go with this. Best of luck!