Take a look at the original sentence again:
While flirting on the phone with the satellite dish salesman, Rose forgot
about the omelet cooking in the kitchen, she
did not expect the stovetop fire that filled the house with smoke.
You wanted to fix it this way:
While flirting on the phone with the satellite dish salesman, Rose forgot
about the omelet cooking in the kitchen she
did not expect the stovetop fire that filled the house with smoke.
To delete the comma between kitchen and she would cause an equally bad problem, a fused sentence. A fused sentence occurs when you have two main clauses joined with no punctuation whatsoever. Rose forgot about the omelet cooking in the kitchen is the first main clause. She did not expect the stovetop fire is the second main clause. The spot between kitchen and she needs a stronger break than blank space.
You might want to consult the rules for fixing comma splices and fused sentences.
Go back to the sentence to try again.