FWIW, Rice University loves siblings and multiples.
I mean, it’s not a huge school, and just in the past few years:
http://news.rice.edu/2015/08/17/move-in-day-times-three/
http://www.ricethresher.org/article/2017/09/a-family-affair
https://www.tmhspost.com/student-life/2017/05/05/twins-take-on-rice-university/
https://www.youtube.com/watch?v=hmGIzWBLWd4
http://abc13.com/sports/cinco-ranch-hs-twins-commit-to-rice-university/2120612/
It’s true that there are no package deals, and that this isn’t a hook in any formally-defensible way, but there’s definitely a pattern with Rice - not just with multiples but also with sib-groups entering in different years. Also, while it’s a tough admit, it’s not as far out of range for your sister as the HYPSM type schools. I agree with what was stated above - if you want to stick together, calibrate your applications to her stats, not yours. The difference between her match-schools and yours isn’t a true difference in quality-of-education anyway.
What do you both want to study? And do you want to run XC in college? And if so, are you fast enough for D1, or should you look at D2/D3 options? (Which also includes some top-tier schools like WashU, JHU, UChicago, the Claremont Colleges, etc.)