She needs you, and your input, or she wouldn't have asked.
Twenty is still young , and selfish to anyone elses thoughts or feelings.
She's not considering how this might affect you and your husband.
All she can see at her age ...is her.
That's not intended as a slight , but just the way of the world.
You have a long time left to be be with your husband...She will make her own way in the world.
If you value your relationship give it a lot of thought.
Acouple of months of turbulence is a lifetime to a young person, but a life on your own for the sake of what might be a bit of teenage angst.......
I wish you good luck