No offense, but the fact that you are asking this as a question clearly demonstrates that the details of this alleged manipulation are sorely lacking.
I believe the woman you reference was testifying in Michigan.
If a machine "switches votes" from one candidate to another in a precinct where the voters actually cast paper ballots that are counted by the machine, then a hand recount of the ballots would immediately expose the whole thing as a fraud.
From what I've read, the use of fully electronic voting machines with no paper ballots may have been more widespread in the past, but this method of voting accounts for less than 5% of the precincts in the U.S. today. Sidney Powell's apparent ignorance about this simple fact exposed her as completely unfit to make any kind of legal challenge to the election. She wasn't even fit to make intelligent public comments about the matter.
Philadelphia was the epicenter of illicit (and potentially fraudulent) ballots being counted in Pennsylvania.
Philadelphia doesn't use Dominion machines to count votes.
They didn't need the machines to rig anything. They just counted hundreds of thousands of votes without any regard for whether they were cast legitimately.
I don’t know anything about voting machines or Dominion, but I do trust the election supervisor and board of Coffey County GA. In a video widely shared on-line they were astounded that the Dominion voting machines allowed so much vote manipulation.