Sorry to hear about your friend's cancer.
Is there a chance you can take Eiwen with you on this trip? Nursing babies are more portable than bottle fed, most of the time :wink: , as long as you are comfortable nursing in public.
Anyway, I doubt she would wean herself in two days. If you are confident in your dh parenting skills and prefer her to stay home where she has a consistent bedtime, he can offer her a sippy cup if she would take it for every meal. That way she will know dh is for sippy cups and mom for breast.
HTH