This is sorta a secret, but I'll tell you where to find Bella.
There is no Bella Goth in The Sims 3! But there is Mortimer, right, Mortimer Goth?, as a kid! So let's think, Bella dissappeared as an adult, right? So she was a kid, and is in the sims 3. Her name is Bella Bachelor which is the name she had before getting married. She is about 9. I'm not exactly sure. She lives with her parents Simis and Jocasta Bachelor in The Bachelor household.
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Bella will be in Sims 3 but she is a child and her last name is Bachelor so that is the household she lives in and Mortimer is a child so you can help them meet. Sims 3 is the time before Sims 1 and 2 it's very interesting.
Yes, young sims have to go to school, on The Sims games. Including The Sims Deluxe Edition, The Sims 2, Pets, and especially The Sims 3. Actually, young sims dont HAVE to go to school. For example, on the Sims PS2 (It's the same as the computer version) I skipped school while playing on the GOTH family in Play the Sims. Although Cassandra (the little girl in the GOTH family) got a C. So I recommend you send them to school.
You just need high speed internet to do a live stream on the SIMS 3.
No.
There is no such thing as a witch on The Sims 3(yet...), but you can cast spells by going on to TheSims3.com, then go to the store and buy Lady Ravendancer Goth's Book o' Spells. Then install it into your game. That way you can cast spells.