Yes....get away from the woman as quickly as possible. Seriously.
That's the type of business my husband had for years and years, and like Amigo, he's seen it all.
Many people have absolutly NO idea what it takes for a job, the costs, time and skills involved.
Customers like her will haggle you down to a nickels worth of profit, and still think they are paying too much. Plus she'll complain about the workmanship. Don't let her waste your time.
Give your bid, make it fair, and business will come your way. Over the years the bulk of my husbands work came from either repeat business or direct referrals from customers...oh, that's another thing, make sure you make a portfolio of your work to show customers.
Speaking of your time (above), people thought nothing of calling on Sundays, holidays, nights to see if he was available to come out and give an estimate, or even do "a quick job"
One time this woman (a stranger) somehow got our home phone # and I answered. It was a Sunday morning, couldn't have been past 10am. I told her he wasn't in, and she pretty much demanded I contact him and tell him she needed him out there THAT MORNING, between 10:30 and 11:30am to give an estimate. She made it very clear it couldn't be past that time because "It's Sunday, and I've got a church function that's going to take all afternoon."
I told her. "Well, you know, it's Sunday here too."
Her: Yes! That's why I need him to come out right away.
The other thing are the people that will be working for you....oy vey. I hope you have a dependable guy or team set up.
That's a whole 'nother story....Amigo, I'll bet you've got some good stories to tell.