She's not as dependent on food as you think she is. If you miss a week or a month it won't make any difference to the snake's health. Leave it until you get back - you don't need to be regular to the day with snakes - sometimes I feed mine weekly but it's not unusual if I'm away or busy for me to leave it a month or more. Probably gives their metabolism a rest actually, because their metabolism slows right down in the absence of food, as it's meant to.
Jamie