http://www.cfgdr.org/
Perhaps she can contact these great dane resuce folks for assistance with dog food, etc?
They also list Meetup groups for diff regions of Florida. Perhaps she could meet someone helpful via email. I think there is a fee for joining Meetup now, but she can look at the messages, and probably find email addresses.
I'd hate to see anyone ever separated from their woofy, even temporarily!! If that were me, it would surely make my mental health suffer.
I wonder if the big dog food companies donate? Hmmm....
em