Mid-career, low quant score

I'd appreciate some help from someone who has advised mid-career applicants. I haven't seen a lot of mid-career stories, so I'm not sure where I stand. I'm a mid-30s woman and plan to apply to a few full-time one-year programs. Lehigh and Katz specifically have programs that look like good fits. I work in sales for a book publisher. My undergrad is in English and German. I never took an accounting or finance class, but working in sales, I deal with sales reports, P&Ls, and the finance department on a regular basis.

I studied for the GMAT for about 6 weeks. The quant section was always going to be difficult for me, so I did three sessions with a math tutor. I took the test yesterday and got a 640: Q35 (26 percentile) and V42 (96 percentile). I'm disappointed in my low quant score, but it was never much higher than that in my practice tests.

I've been hoping that a mediocre-decent score, combined with my long work history and a compelling essay would be good enough to get me into the school of my choice (hopefully even with a scholarship). But what do you all think? Is my low quant score going to doom my application, even though I'm not applying to top-tier schools?

I'd prefer not to retake the GMAT. I'd rather take a business math class at a local college before starting an MBA program if it would help.