X-Men vs. Street Fighter - 1996
Cammy skips Street Fighter III (as did most Street Fighter II characters) and shows up in the first Marvel/Capcom mash-up. The Alpha character sprites were recycled for this series, and the character art is similar to Alpha's.
Above: Have you noticed something about Cammy's scar? It constantly changes cheeks
Marvel vs. Capcom 2: New Age of Heroes - 2000
Marvel vs. Capcom 2 doesn't see a different Cammy sprite, but it is responsible for some nice character art.
Capcom vs. SNK series - 1999 - 2003
Cammy's sprite once again goes untouched in these two Capcom/SNK collaborations. Capcom was criticized for redrawing some of the sprites in CvS 2 (based on their SF III appearances) and not others. It does, however, bring us more interesting character art, in a slightly more realistic style (right).
Above: Yet another recycled Alpha sprite