The same reason why 'Lean Back' wouldn't be under Remy's. Terror Squad and Young Money are credited as a collective, not individually. She does have that as her top 10, but it's just industry politics.
Crush on You actually never made it to the Top 10.
From a receipts thread that I've been working on, but more than likely won't ever post b/c I'm lazy lmfao:
Crush on You f/ Lil' Cease & The Notorious B.I.G.
Second single
Release Date: June 13, 1997
UK Peak: #23
5 weeks on the UK chart Youtube Views: 3.6 million views
For some reason, it flopped in the US or, at least, there isn't any data for it. I looked at the top tens for the Rap Songs charts of 1997 and 1998 and it didn't appear there once, so if it didn't make it on a genre chart... I've been meaning to go look at the Hot 100 for those two years tho to "confirm" that it never made it.
