Thanks for providing more information.
As you describe,possible causes may include Burning mouth syndrome,Angioedema.
As she is far away from home so she can try some self care measures like
She should avoid hot,spicy foods.
Also drink plenty of water.
Apply cool compresses with ice packs on swollen lips.
And try OTC Claritin which helps in relieving her symptoms.
Avoid carbonated beverages.
Don't use tobacco
Avoid alcohol and products with alcohol.
Avoid products with cinnamon or mint.
Avoid acidic foods and liquids, such as tomatoes, orange juice, soft drinks and coffee.
Try different mild or flavor-free brands of toothpaste, such as one for sensitive teeth.
And if possible consult your nearby Allergist when she 'll come back to home during vacation.
I hope this helps.
If you have any further query then feel free to ask.
Positive feedback and bonus are highly appreciated.