I wouldn''t worry about it till she calls you. She was having a bad day and was looking for someone to take it out on. Her teenage kid (who is one of those idiots with his pants down around his ***) got some girl pregnant, she hasn't had sex in months cuz she's a shrew, she's put on 30lbs in the last year and probably SUCKS at her job. 
I have to agree with the others though about the insurance....if you are out detailing at businesses and what not you need to get insurance. I do it only at my home, without the customer there, so the need isn't as important as with your situation. I don't think it's something as serious as bad money management as others have stated, but it's something you should look into.
Find out what it costs a month and divide it by the number of cars you do a month. Add that cost to the detail. It shouldn't raise your prices enough to make that big of a difference. Also, look at the product you use...are there other "lower cost" alternatives? (i.e. using woolite/water instead of three or four different, higher cost, interior cleaners)
There are ways to afford it!! Good luck with everything!!:up

I have to agree with the others though about the insurance....if you are out detailing at businesses and what not you need to get insurance. I do it only at my home, without the customer there, so the need isn't as important as with your situation. I don't think it's something as serious as bad money management as others have stated, but it's something you should look into.
Find out what it costs a month and divide it by the number of cars you do a month. Add that cost to the detail. It shouldn't raise your prices enough to make that big of a difference. Also, look at the product you use...are there other "lower cost" alternatives? (i.e. using woolite/water instead of three or four different, higher cost, interior cleaners)
There are ways to afford it!! Good luck with everything!!:up