If your incubator stable I would put the eggs in it. You will not be gone all that long and it's not close to when they will be hatching. It wouldn't hurt to have your sister check on them a few times when you are gone. What type of thermostat are you using? I know I have lost power a couple of times this year and when my Herpstat comes back on it still has the correct temps set. If your female was bigger I might be tempted to let her keep them but you make it sound like she is on the smaller side. If that's the case I would want her back on food ASAP.