She asked me how you were doing, and said she'd give you a call soon.
Is this idiomatic? Should I keep the comma?
Yes, it is, and yes, you should,
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anonymousShe asked me how you were doing and said she'd give you a call soon.
Is this idiomatic? Should I keep the comma?
The comma before 'and' is only for when you introduce a new explicit subject.
She asked me ..., and she said ...
But
She asked me ... and said ...