I just learned that my niece was invited to the honor program in her new high school
Aw, nice! That's kind of cool, actually. I hope you really encourage her to stick to it and do well. Sometimes there can be a lot of expectations that come with that stuff, so whatever you can do to not add pressure to it would be great.
Thank you for the advise, I'll do my best not to pressure her
Yeah, I think her parents or her peers, or even herself probably, may put  a lot of expectations on her. While you want to reassure and encourage her, it's good to not make her plan too far ahead in the future and put all that weight on her. It's what my parents did with me, and I resented them for it.