Regeneration. Abigail regains 5 hit points at the start of her turn if she has at least 1 hit point and isn't in sunlight or running water. If Abigail takes radiant damage or damage from holy water, this trait doesn't function at the start of the Abigail's next turn.

Twofold nature. Abigail is considered as humanoid as well as undead. Not provoked undead won't attack her.

Sunlight sensitivity. Abigail has disadvantage on ability checks in sunlight.

Spellcasting. Abigail is a 4th-level spellcaster. Her spellcasting ability is wisdom (spell save DC 14, +6 to hit with spell attacks). Abigail has the following cleric spells prepared:

Cantrips (at will):  chill touch (2 creatures), guidance, mending, spare the dying, resistance

1st level (4 slots): bane, healing word, sanctuary, shield of faith, ray of sickness

2nd level (3 slots): aid, enhance ability, lesser restoration

Scimitar. Melee Weapon Attak: +5 to hit, reach 5ft., one creature. Hit: 6 (1d6 + 3) slashing damage. 

Claws. Melee Weapon Attack: +6 to hit, reach 5 ft., one creature. Hit: 5 (1d4 + 3) slashing damage. Instead of dealing damage, Abigail can grapple the target (escape DC 13).

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one willing creature, or a creature that is grappled by the vampire, incapacitated, or restrained. Hit: 6 (1d6 + 3) piercing damage plus 7 (2d6) necrotic damage. The target's hit point maximum is reduced by an amount equal to the necrotic damage taken, and the vampire regains hit points equal to that amount. The reduction lasts until the target finishes a long rest. The target dies if this effect reduces its hit point maximum to 0.