🚀 go-pugleaf

I've come across a problem in my all-too-amateurish writing and am asking those  
more experienced (or just more imaginative) for help.  There is a certain flow  
I wish to maintain in putting a thought or a description inside a spoken  
sentence, but no particular construction seems right to me.  Here is an example  
of the sort of thing I'm working with:

She said, "I'm posting you about my problem--" Her hands became clumsy on the  
keyboard. "--and I hope you're able to help me."

That's the best construction I had come up with, so I knew that it was past  
time to get help; it's just not right to put a complete sentence in the middle  
of the spoken phrase.  Possibly the dashes could be placed outside the  
quotation marks:

 . . problem," --her hands became clumsy on the keyboard-- "and . . .

A large part of the problem is that the flow, the feel of the passage is  
destroyed if I put the description somewhere more convenient.  Any  
ideas--parentheses, maybe?
Thanks for your help.  Please post rather than mailing--my machine refuses to  
acknowledge existence beyond itself just now.
Rand