did she go through her 3 month growth spurt early? if so, then that may be the case this time.
otherwise, i would suspect that the disruption sounds developmental - has she learned any new skills lately?
during a growth spurt if you are bf you will probably feed more often; if bottle fed just add some extra food to the bottles. after a few days you should be fairly sorted out.
either way, persist in consistency. continue to try & soothe in the crib for as long as you can - either until naptime is normally up or you're going crazy! :wink:
HTH