Hollow(Penance) vs. Lilith(Daughter of Dracula) Opening Debate:
Bios first!
Hollow:
Penance's skin, hair, and clawed hands and feet are harder than diamond, and are sharp enough to shred the skin of anyone touching her. Her ultra-dense hide is superhumanly durable, but her strength seems normal.
Lilith:
She has traditional vampire-powers, to a higher degree than most, lacking most traditional limitations.
She has superhuman physical abilities, and can mesmerize others with a glance, transform partially or fully into a bat or mist, control the weather, and command animals, such as rats, bats and wolves.
She's immune to sunlight, religious symbols and garlic, but can be destroyed by the Montesi Formula or a wooden stake through the heart. She recovers instantly from most other wounds (even surviving dismemberment), and her spirit will return as long as Dracula exists.
The fight:
This just isn't much of a fight; there isn't anything Penance can do that will take out Lilith, as she won't have access to the Montesi Formula or can get her hands on a wooden stake. Penance simply cannot hold items in her hands, because they'd simply destroy them. Plus, except for her durability, she's limited in all other aspects.
To begin this fight, Lilith will take the form of a bat or mist, and in that way, she's either unreachable (bat) or unable to harm (mist). Lilith can simply mesmerize her opponent if need be.
Penance can be defeated, as it's shown how Emplate has captured her in Generation-X; or, in The Loners, "she has been held captive by MGH-harvesting drug dealers."
It appears Penance works best within a team environment; otherwise, she can be captured...or, she has probably learned it's best to flee at this point. As in Gen-X, "Penance awakens with one thought on her mind: survival. Perceiving the infirmary as a cell, she escapes, tearing the room apart in the process." I'm almost betting that in this setting, not really understanding what is going on, she'll try to high-tail it out of Avengers Mansion, especially when she discovers she cannot harm Lilith.
Winner = Lilith, Daughter Of Dracula