My niece is coming to Florida in May && I plan on taking her && my kids to SeaWorld. I was wanting to get her the PreK Pass Card. Will I be able to get her a pass even though she is not from Florida or doesnt reside in Florida?

I believe Marc covered this well!

Yes

Free admission for children 5 years old and younger Limited time offer: Kids 5 and younger can enjoy FREE admission to SeaWorld Orlando and Busch Gardens Tampa Bay throughout all of 2018 with the Preschool Card. There’s never been a cooler time to be a kid! Must register online. Not available at the park.  Redeem your Preschool Card by visiting any SeaWorld or Busch Gardens ticket window and present all of these: Your registration confirmation Your child's birth certificate or travel passport Your Florida resident ID That's from their website so I'm guessing passport or birth certificate and your license for Florida residency would be sufficient but you'd better call them to make sure

I don't know, but you can contact them.