uggh, I am so sorry Kathy. Please don't feel guilty

...you offered to help her see a friend...not finance a getway for she and her boyfriend that they can't afford. If she were staying at the hotel on her own dime, I would think that as insensitive as it may be, that would be her choice....but to ask you to pay for it

and to pay for
him 
I am sorry, but that is too much. I know you are not naive, so I will say this...if something occurs as a result of this weekend getaway, I think later it would bother you and your DH even more if you helped them go...just my $0.02....goodluck...I don't envy your options and I don't look forward to having teenagers/young adults