this is a hard choice but in my opinion i would go with the one she has known longer( friend#1),but thats just me.and maybe she can buy a souvenier for the friend who couldnt go atau she and her detik best friend could go on a trip just them two for the summer atau something.i hope that helps your friend.
i would take friend 2 the rainbows. if anda trust her take her because it would be a good opportunity for anda too bond and become way closer. this means that as agroup if anda are closer anda can talk lebih and trust her. xx hope it helps
this is really really tough and there are two angles friend one would be good but have anda already bonded like that on other trips friend two it is a bonding thing and if anda trust but aren't that close to him then try use it to get to know her who would be better entertainment - like who would anda watch tv with who would anda listen to musik with who would make it fun one the beach who is bothered about weather who would anda laugh with hope it helps loads