appropriate, given

[kingston_123]

Ruth: I just think it's appropriate, given how much you seem to hate Christmas this year.
Amy: Mother, I don't hate Christmas.

why there is comma before "given"?
Source: A Bad Moms Christmas (2017)

 

[tedmc]

Why is there a comma before "given"?

Because there is a subordinate clause that follows.

 

[Raymott]

It's also a natural pause, given that this is a dialogue.