I think you have let a few worrisome niggles take on a life of their own here.
You can't see the wood for the trees.
I can understand some concern, but you must keep them in proportion, or they will consume you, and most likely your relationship with your daughter.
I'm sure that she has considered the impact on you, her daughter and herself, but she has decided this man is special enough that everything will be ok.
There is no reason why it shouldn't, so beware of appointing yourself into that role.
Is it rude to not finish a book club choice that was selected by someone else?
The King's Speech To Announce 'All But The End Of Leasehold System' System'


