I loved Sarah Michelle Gellar in Buffy the vampire slayer.
Yes, she was great in that....As a young girl she started out in advertisements and stage roles.
What advertisements did she do?
Not sure what ads but she first started in a made for tv movie in 1983, it was called an invasion of privacy.
I did not know that. Any idea on where I can watch that tv movie?
I'm not sure, I can't find any info but I'm sure you can watch it somewhere online.
Has she appeared in anything more recent?
She played in cruel intentions in 2016
I believe she played in that movie in the 2000 not 2016. Who did she play again in the scooby doo movies?
She played as daphne in Scooby Doo.
Thanks for all the information. 
I'm happy to help!