So if she needs to go, absolutely needs to go, maybe one of your daughters would also like to go. Compromise, Mom and daughter sleeps in the same room.
Not the same as trust.
But if she is ok with the idea...maybe nothing was planning on happening.
As an aside,
You wife is heading out of town to see an art exhibit and a film. Something that is not your thing. Is your wife your thing? Is spending time and doing stuff with her your thing?
I'd personally expand your list of 'things' otherwise someone else...like this old BF might.
Experience is a brutal teacher, but you learn. My God, do you learn. - C.S. Lewis
Life is usually all about how you handle Plan B. - Jack3Beans
Listen without defending; Speak without offending - FaithinAK