Welcome Beau and Rachel! We love hearing rescue stories like yours. Every dog deserves loving and caring owners like you.
I'm Kristine, mom to 4-year-old Newf Rosie. It's funny how those Newf traits are so universal sometimes... like the pining. Rosie does that too, she'll crowd your space, sit as close to you as possible, and keep raising her head as if to say 'So are you going to pet me or not?'
The glucosamine is a great preventative measure to take now. That with chondroitin, vitamin C, and some form of fish oil all mixed into her food. Also swimming would be a great form of exercise for Beau, since it's low impact and will strengthen those bones and muscles.