How long has she been flowering for?
I see lots of fresh pistils that normally indicate it's still bulking up, but it looks like there are some older bits inside the flower.
If you wait for the fresh bits to be ready, the flower inside may stat to degrade, but I can't see well enough to be 100% sure.
If all is well, she has at least 2 weeks to go, so hopefully done just before you leave, but have you thought about how you are going to dry and cure if you're away for a month, someone will have to help. Drying normally takes 10 to 14 days ideally and then you need to trim and jar it and burp for the first week or 2. If you leave it to dry for a month, you'll probably end up with really dry bud and lose a lot of terps/flavor. Hopefully you have someone that can help