The Glock 36 is a single-stack 7 shot compact .45 model. It is designed for those with smaller hands, and would be a good choice for you. The#21 is the Large frame, and the #30 the medium frame Glock .45's.
They are a great design, and VERY resistant to corrosion and abuse.
****NOTE***** You will have to remember to keep the weapon properly lubed if you plan on just leaving it in your car. Heat and Humidity dry out the parts.