How to break up wih a friend?

i have a friend that i want to keep but i just dont like her ya'know? she like a backup friend when noone is arorund. i wnat to go camping with my bffae but my backup friend is counting on me to go with her! maybe i should brake up (not in a relationship way) with her? cuz i dont wannt to hurt her by telling her cuz i still care about ehr.