Assuming your daughter isn't like 4 or something, if she's at least 8 or so. There's nothing actually scary about the vampire pack and ut offers a lot of fantasy gameplay bang for the buck. Lilith and Caleb Catore are a brother and sister who are kind of set up as the "nice" vampires of the game, with a light Victorian Gothic color scheme house, and all they seem to do is sit and play chess together. They are super friendly. The other vampire is Vlad who lives alone in a suitably dark and Gothic manor house and he's a loner who love playing his pipe organ and greets every new Sim with some welcome message and a "nice neck you have there" message.
Mileage appears to vary a lot for whether you get any nightly visits after the first one and for my games, most of the time, instead of feeding on a sleeping Sim, Vlad (or more rarely Caleb or Lilith) would sit there watching TV or playing on the computer or reading books, or cleaning the house, then leave...or worse, stand outside all night, waiting yo be let in, then keave.
Suffice it to say, the vampire pack offers cool Victorian decorating and building options and some fun fantasy, but has been so de-fanged that it's almost a joke. It's cutesy, not creepy.so if she likes magic type stuff or Halloween aesthetics or the storyline of the apologetic Vegetarian vampire who would rather drink plasma fruit (Caleb) it's harmless fun.
I haven't tried the werewolf pack myself but from reviews it appears as silly and free of anything remotely scary. Not a selling point for me, personally, but pretty much everything in sims4 is geared to be child-level amusement.
So nice that you can enjoy this with her! ?