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They can have vaginitis/urinary tract infection/infection around the vulvar area...and it could be the anal glands that are located just inside the rectum. The anal glands are usually expressed on the feces, but sometimes they are expressed at other times like fear or excitment and they have a very strong foul oder.
Do you notice any licking in the vulvar area? Any swelling, discharge, reddness?
If she was having a problem serious enough to emit a strong odor...you will be able to see evidence of a problem in that area.
If not...she should be fine. IF you notice she drags her rear end sometimes...that is anal glands and should be expressed now or when you return from your trip.